Article(id=1246416858870599910, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246416853124407707, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-4193.2019.07.008, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1548172800000, receivedDateStr=2019-01-23, revisedDate=1554307200000, revisedDateStr=2019-04-04, acceptedDate=null, acceptedDateStr=null, onlineDate=1775098536460, onlineDateStr=2026-04-02, pubDate=1563984000000, pubDateStr=2019-07-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1775098536460, onlineIssueDateStr=2026-04-02, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1775098536460, creator=13701087609, updateTime=1775098536460, updator=13701087609, issue=Issue{id=1246416853124407707, tenantId=1146029695717560320, journalId=1149651085930835976, year='2019', volume='41', issue='7', pageStart='1', pageEnd='158', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1775098535083, creator=13701087609, updateTime=1775200282549, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1246843612969984921, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246416853124407707, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1246843612969984922, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246416853124407707, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=92, endPage=102, ext={EN=ArticleExt(id=1246416859290030320, articleId=1246416858870599910, tenantId=1146029695717560320, journalId=1149651085930835976, language=EN, title=The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag, columnId=1243867132006613042, journalTitle=Haiyang Xuebao, columnName=Marine Geology, runingTitle=null, highlight=null, articleAbstract=

The Weixi’nan Sag is the important research area of exploration and development integration. This study takes the Weizhou Formation of the No.2 Fracture Zone as the research object. By analyzing the geometry, kinematics, and dynamics characteristics of fracture, the "slope-flat" fault system in the middle section and the "shovel-type" fault system on both sides are divided into the level 3 en-echelon main fracture zone, the level 4 branch fracture zone, and the level 5 branch fracture zone. The "slope-flat" fault system in the middle section is subjected to higher in-situ stress, and the main and branch faults are more developed. The vast majority of oil and gas are distributed in the "slope-flat" fault system. A comprehensive analysis of the relationship between the internal fracture system of the differential fault system in the No.2 Fracture Zone and the oil-gas distribution law is made, and obtains the corresponding regular of 3 aspects of fracture reservoir controlling mechanism and 8 types of fracture reservoir controlling patterns. Under the regular of fracture reservoir controlling mechanism and patterns, the search and evaluation of targets are carried out around the inner or surrounding oil fields of the No.2 Fracture Zone, and good results are obtained. Based on the field production, the potential targets of North 1, North 3 and North 4 in the middle part of the No.2 Fracture Zone are searched and optimized. The three blocks have been successfully drilled, and the purpose of the geological reservoir has been achieved. The regular of fracture reservoir controlling mechanism and patterns which have been applied to the potential zone of the No.2 Fracture Zone in the southwest depression play very good effect.

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涠西南凹陷是勘探开发一体化研究重点区,本文以二号断裂带为研究对象,综合断裂动力学特征、运动学特征、几何学特征等研究,将中段“坡坪式”断裂体系、两侧“铲式”断裂体系等差异性断裂体系内部划分为3级雁列式主断裂、4级分支断裂、5级分支断裂。中段“坡坪式”断裂体系受到更高强度地应力作用,主断裂与分支断裂更为发育,二号断裂带绝大多数油气分布于此。综合分析二号断裂带差异性断裂体系内部断裂系统与油气展布规律之间的关系,得到3方面断裂控藏规律及4种优势断裂控藏模式。在断裂控藏规律及断裂控藏模式的指导下,搜索、优选二号断裂带中段北1块、北3块、北4块潜力目标进行评价、实施。3个潜力区块均实施成功,达到地质油藏目的,断裂控藏规律、断裂控藏模式在涠西南凹陷二号断裂带潜力区块应用效果好。

, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=版权所有©《海洋学报》编辑部 2019, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=eA/e62eTE0wQ2kuqmH+n6w==, magXml=n35Kaic5dyL3yQfmY/EEsw==, pdfUrl=null, pdf=rTfwcCyEvO4iVezP97MmSg==, pdfFileSize=2597620, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=Rcpw0/0aOpKxfOoaOBEbLA==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=BY3kQEfPR3r6AKMAAdpzOA==, mapNumber=null, authorCompany=null, fund=null, authors=

陈奎(1986—),山东省新泰市人,主要研究方向勘探开发一体化研究工作。E-mail:

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陈奎(1986—),山东省新泰市人,主要研究方向勘探开发一体化研究工作。E-mail:

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陈奎(1986—),山东省新泰市人,主要研究方向勘探开发一体化研究工作。E-mail:

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涠西南凹陷二号断裂带断裂控藏研究及应用
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陈奎 1 , 周家雄 1 , 张辉 1 , 李茂 2 , 姜占东 1 , 孙晓晖 1 , 潘知峰 1 , 李春宁 1
海洋学报 | 海洋地质 2019,41(7): 92-102
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海洋学报 | 海洋地质 2019, 41(7): 92-102
涠西南凹陷二号断裂带断裂控藏研究及应用
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陈奎1 , 周家雄1, 张辉1, 李茂2, 姜占东1, 孙晓晖1, 潘知峰1, 李春宁1
作者信息
  • 1 中海石油(中国)有限公司湛江分公司,广东 湛江 524057
  • 2 中海石油(中国)有限公司油气储量办公室,北京 100010
  • 陈奎(1986—),山东省新泰市人,主要研究方向勘探开发一体化研究工作。E-mail:

The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag
Kui Chen1 , Jiaxiong Zhou1, Hui Zhang1, Mao Li2, Zhandong Jiang1, Xiaohui Sun1, Zhifeng Pan1, Chunning Li1
Affiliations
  • 1 Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, China
  • 2 Reserves Office, CNOOC China Limited, Beijing 100010, China
出版时间: 2019-07-25 doi: 10.3969/j.issn.0253-4193.2019.07.008
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涠西南凹陷是勘探开发一体化研究重点区,本文以二号断裂带为研究对象,综合断裂动力学特征、运动学特征、几何学特征等研究,将中段“坡坪式”断裂体系、两侧“铲式”断裂体系等差异性断裂体系内部划分为3级雁列式主断裂、4级分支断裂、5级分支断裂。中段“坡坪式”断裂体系受到更高强度地应力作用,主断裂与分支断裂更为发育,二号断裂带绝大多数油气分布于此。综合分析二号断裂带差异性断裂体系内部断裂系统与油气展布规律之间的关系,得到3方面断裂控藏规律及4种优势断裂控藏模式。在断裂控藏规律及断裂控藏模式的指导下,搜索、优选二号断裂带中段北1块、北3块、北4块潜力目标进行评价、实施。3个潜力区块均实施成功,达到地质油藏目的,断裂控藏规律、断裂控藏模式在涠西南凹陷二号断裂带潜力区块应用效果好。

涠西南凹陷  /  构造圈闭  /  断裂系统  /  油气展布  /  断裂控藏规律

The Weixi’nan Sag is the important research area of exploration and development integration. This study takes the Weizhou Formation of the No.2 Fracture Zone as the research object. By analyzing the geometry, kinematics, and dynamics characteristics of fracture, the "slope-flat" fault system in the middle section and the "shovel-type" fault system on both sides are divided into the level 3 en-echelon main fracture zone, the level 4 branch fracture zone, and the level 5 branch fracture zone. The "slope-flat" fault system in the middle section is subjected to higher in-situ stress, and the main and branch faults are more developed. The vast majority of oil and gas are distributed in the "slope-flat" fault system. A comprehensive analysis of the relationship between the internal fracture system of the differential fault system in the No.2 Fracture Zone and the oil-gas distribution law is made, and obtains the corresponding regular of 3 aspects of fracture reservoir controlling mechanism and 8 types of fracture reservoir controlling patterns. Under the regular of fracture reservoir controlling mechanism and patterns, the search and evaluation of targets are carried out around the inner or surrounding oil fields of the No.2 Fracture Zone, and good results are obtained. Based on the field production, the potential targets of North 1, North 3 and North 4 in the middle part of the No.2 Fracture Zone are searched and optimized. The three blocks have been successfully drilled, and the purpose of the geological reservoir has been achieved. The regular of fracture reservoir controlling mechanism and patterns which have been applied to the potential zone of the No.2 Fracture Zone in the southwest depression play very good effect.

Weixi’nan Sag  /  structural trap  /  fracture system  /  oil and gas distribution  /  fracture reservoir controlling mechanism
陈奎, 周家雄, 张辉, 李茂, 姜占东, 孙晓晖, 潘知峰, 李春宁. 涠西南凹陷二号断裂带断裂控藏研究及应用. 海洋学报, 2019 , 41 (7) : 92 -102 . DOI: 10.3969/j.issn.0253-4193.2019.07.008
Kui Chen, Jiaxiong Zhou, Hui Zhang, Mao Li, Zhandong Jiang, Xiaohui Sun, Zhifeng Pan, Chunning Li. The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag[J]. Haiyang Xuebao, 2019 , 41 (7) : 92 -102 . DOI: 10.3969/j.issn.0253-4193.2019.07.008
北部湾盆地涠西南凹陷是勘探开发高成熟凹陷,是南海西部海域最重要的原油产区,是勘探开发一体化研究工作的重点区域,主要工作是围绕油田内部及周边开展潜力目标搜索、评价及井位部署实施[1]。渐新世中晚期为涠西南凹陷第二期断陷活动期,导致涠洲组地层断裂极其发育,形成大量的构造成因圈闭[2-3]。涠洲组是涠西南凹陷最重要的含油层系[4-6]。涠洲组构造圈闭是勘探开发一体化目标搜索和评价的重要层系及圈闭类型[7]。涠西南凹陷具有复杂断裂系统,是在基底先存构造基础上,在递进变形过程中逐渐形成的[8]。断裂系统研究包括断裂的几何学、运动学、动力学特征研究。在此基础上,落实断裂系统与油气展布间关系,得到断裂控藏规律。当前涠西南凹陷断裂系统划分及断裂控藏规律研究尺度集中在控盆、控凹断裂等大型区域断裂带[9]。当前断裂系统划分及断裂控藏规律研究尺度、精度不足于支撑勘探开发一体化研究,需要将研究尺度精细到区域断裂带内部。针对以上问题,通过对断裂及断裂控藏规律进行研究[10-17],以涠洲组油藏优势富集区二号断裂带作为研究对象,将研究尺度精细至断裂带内部,通过“断裂带内部断裂系统划分” “断裂系统对油气展布规律的影响”进行研究,形成一套区域断裂带内部断裂控藏规律评价技术,取得了很好的应用成效,为其他区域断裂带的研究提供技术支持。
涠西南凹陷整体构造为北断南超,自北向南发育涠西南断裂带、一号断裂带、二号断裂带、三号断裂带,周缘发育斜阳斜坡带、南部斜坡带、涠西南低凸起(图1)。
涠西南凹陷古近纪以来先后经历裂陷期和裂后热沉降期。古近纪裂陷期发育陆源湖相沉积,沉积地层包括古新统长流组、始新统流沙港组、渐新统涠洲组,其中,流沙港组包括流三段、流二段、流一段,涠洲组包括涠三段、涠二段、涠一段。新近纪裂后热沉降期发育海相沉积,沉积地层包括中新统下洋组、角尾组、灯楼角组,上新统望楼港组(图2)。
研究区二号断裂带是涠西南凹陷油气富集区,平面上分布多个油田(图1),纵向上多层系成藏,涠洲组是其最重要的含油、产油层系。
二号断裂带自白垩世晚期开始活动,是涠西南凹陷构造运动强烈区,在SE-S向右旋拉张应力作用下形成多条NEE向雁列式主断裂及分支断裂。二号断裂带内部断裂系统划分,主断裂与分支断裂对于油气成藏作用研究至关重要。
断裂系统是在一定区域构造应力场中形成的各种不同性质的断裂组合[18],与油气运移、保存相关,是油气成藏的重要控制因素。同一断裂系统的断层空间排布、相互交切关系及断层力学机制、位移特征等都具有密切的成因联系。断裂系统划分研究是在地层压实恢复、剥蚀地层恢复的基础上,对断裂动力学、运动学、几何学特征进行综合研究。
研究区所在的北部湾盆地涠西南凹陷位于南海北部陆架,主要受欧亚板块、太平洋板块、印度洋板块三大板块相互作用的影响[4]
晚白垩世末期,印度洋板块沿NNE向快速俯冲至欧亚板块之下,导致欧亚板块隆升形成喜马拉雅山,进入喜马拉雅期。由于此时太平洋板块俯冲至欧亚板块的速率远小于印度洋板块的俯冲速率,因此,中国东部及邻区产生右旋剪切拉张应力场,地壳拉薄、地幔上涌,南海开始形成。
中晚渐新世,印度洋板块俯冲作用减弱,太平洋板块俯冲速率增强,两板块俯冲速率相当,此时右旋拉张应力变弱,太平洋板块的俯冲导致中国东部及邻区构造抬升,部分地层剥蚀。这与涠西南凹陷渐新世末期区域构造隆升,涠一段、涠二段部分地层剥蚀的情况相吻合。
中新世至今,地幔流冷却导致构造持续沉降,形成海相沉积环境,进入坳陷阶段。此时,太平洋板块俯冲速率大于印度洋板块。涠西南凹陷由于距离太平洋板块俯冲带相对较远,板块俯冲作用影响相对较小,进入坳陷期,断裂不发育。
区域动力学特征分析显示,喜马拉雅运动以来,研究区所在的南海区域整体上受到SE-S向右旋拉张应力作用的影响,南海及围区地幔流应力场流线图也印证了这一认识[4]图3)。
古近纪,在SE-S向区域构造应力作用下,二号断裂带形成并活动。利用“断裂生长速率”对断裂形成和活动时期等运动学特征进行研究。
断裂生长速率综合考虑断裂上、下盘地层厚度及相应沉积时间,是指某一地层单元在一定地质历史时期内,因断裂活动形成的落差与相应沉积时间的比值[19-20],即:
$ {V_f} = \frac{H}{T} = \frac{{\left( {{H_2} - {H_1}} \right)}}{T}, $
式中,Vf为断裂生长速率,单位:m/Ma;T为沉积时间,单位:Ma;H2为断裂上盘地层厚度,单位:m;H1为断裂下盘地层厚度,单位:m。
选取涠西南凹陷二号断裂带9条雁列式主断裂,对古近纪断陷期长流组–涠一段断裂生长速率进行计算、统计。长流组、流三段、流二段、涠二段、涠一段生长速率均大于0,平均生长速率在10~60 m/Ma之间,断裂活动性较强;流一段、涠三段生长速率均接近0,断裂不活动(图4)。
通过对二号断裂带雁列式主断裂生长速率综合研究,认为二号断裂带为二期活动断裂,早期长流组–流二段活动,晚期涠二段–涠一段活动,流一段–涠三段断裂不活动。
断裂运动学特征研究主要针对二号断裂带主断裂,在SSE-S向右旋拉张应力作用下,主断裂会破裂产生多条分支断裂。通过对二号断裂带雁列式主断裂、分支断裂剖面几何学特征与平面几何学特征分析,落实主断裂与分支断裂静态关系[21]。将断裂体系划分为两种差异性断裂组合样式,一种为平面“帚状”组合、剖面“负花状”组合的“坡坪式”断裂体系,主要分布在二号断裂带中段;另一种为平面“雁列”组合、剖面“断阶”组合的“铲式”断裂体系,主要分布在二号断裂带两侧(图5)。
在区域构造应力作用下,两种差异性断裂组合样式具有某些相似的几何学特征。雁列式主断裂大多断穿T60~T100地震反射面(古近系地层);古近纪断陷期断层倾角为10°~58°,平均约40°,倾向为偏南向;断裂走向由早期的NEE向顺时针逐渐过渡至近EW向;平面延伸长度相差不大,均在6.4 km左右。各分支断裂按断穿层位分为早期断裂、晚期断裂,分别收敛于流二段塑性泥页岩层的底面(T86)、顶面(T83)附近(图5),涠洲组主要发育晚期断裂;各分支断裂走向与主断裂相近,为NEE-EW向。
两种差异性断裂组合样式具有不同的几何学特征。“坡坪式”断裂体系雁列式主断裂垂直断距平均930 m,水平断距平均960 m,均大于“铲式”断裂体系,垂直断距平均720 m,水平断距平均700 m,说明在地质历史时期“坡坪式”断裂体系受地应力更强,断裂活动更为强烈。总体上,二号断裂带雁列式主断裂垂直断距集中分布在0~1 km,水平断距集中分布在0~1.5 km,断裂活动强烈(图6)。“坡坪式”断裂体系主断裂密度为0.34~0.69 条/km2,明显大于“铲式”断裂体系主断裂密度0.09~0.29 条/km2,同样证明“坡坪式”断裂体系所受地应力强度更高,断裂活动更强。
在较强地应力作用下,“坡坪式”断裂体系主断裂发生掀斜作用,涠洲组后期发育分支断裂倾向既有偏南向,又有偏北向,而“铲式”断裂体系涠洲组期 发育分支断裂倾向与主断裂相同,均为偏南向(图7)。
总体上,分支断裂断层倾角34°~78°,平均53°(图8)。“坡坪式”断裂体系分支断裂垂直断距平均78 m,水平断距平均100 m,均大于“铲式”断裂体系,垂直断距平均39 m,水平断距平均63 m,进一步说明“坡坪式”断裂体系受地应力更强,造成分支断裂更发育。总体上,二号断裂带雁列式主断裂垂直断距和水平断距集中分布在0~100 m(图9)。
综合断裂动力学特征、断裂运动学特征、断裂几何学特征等研究认为,二号断裂带涠洲组地质历史时期为涠西南凹陷后期断裂活动期,分支断裂均为主断裂后期断裂活动时在右旋拉张应力作用下形成的。
按照断裂几何学形态对二号断裂带“坡坪式”断裂体系、“铲式”断裂体系断裂系统进行划分。区域上,涠西南大断裂作为控盆断裂为1级断裂,一号断裂带作为控凹断裂为2级断裂,二号断裂雁列式主断裂作为区域控圈断裂为3级断裂。针对二号断裂带内部,综合断裂动力学、运动学、几何学特征,将二号断裂带断裂系统划分为3个级别,其中,雁列式主断裂为3级断裂,雁列式主断裂次一级分支断裂划为4级断裂,4级断裂的次一级分支断裂划为5级断裂(图10)。
前述分析,“坡坪式”断裂体系所受地应力强度更高,断裂活动更强,3级雁列式主断裂及4级、5级分支断裂更为发育,与“铲式”断裂体系相比,更有利于构造圈闭发育,更有利于油气沿断裂垂向运移、保存。
二号断裂带是涠西南凹陷重要的油气富集区。将油藏按照纵向、平面展布特征分别进行统计。平面上,多个油田沿二号断裂带呈带状展布。纵向上,油藏分布在角尾组–石炭系等多个层系,其中,深层系油藏集中分布在二号断裂带两侧油田,例如J油田流三段油藏数量占52%(图11);涠洲组油藏集中分布在二号断裂带中段,例如E油田涠洲组油藏数量占55%(图11)。
二号断裂带油气展布不是偶然、随机的,而是与断裂系统密切相关。古近纪时期二号断裂带断裂活动强烈,断裂极其发育,断裂间既具有差异性,产生大量的大型断裂及小型断裂,又具有相关性,形成断裂系统,共同控制油气的运聚保存。
针对裂陷期不同时期二号断裂带断裂发育特征与油气藏分布响应关系开展研究。研究发现,二号断裂带主要含油层系流三段、流一段、涠三段、涠二段油气绝大多数分布在“坡坪式”断裂体系(图12)。
油气成藏研究的关键为断裂对于油气输导、遮挡作用研究[22-23]。二号断裂带中段“坡坪式”断裂体系在更高强度的应力作用下,3级雁列式主断裂与4级、5级分支断裂更为发育。主断裂在早期长流组–流二段,晚期涠二段–涠一段活动。油气主要来源于B生油洼陷,其排烃高峰为涠二段至今。主要含油层系圈闭形成时期与断裂活动时期、生排烃高峰期相匹配。成藏关键模式为“源–断–脊–砂–圈”模式,烃源岩成熟后油气在排替压力差驱动下,通过沟源断裂等运移通道垂向运移,再通过构造脊、不整合面及砂岩侧向运移至圈闭目的层段聚集(图13)。
对二号断裂中段“坡坪式”断裂体系断裂遮挡作用进行分析。利用TrapTester软件[24]对4级遮挡断裂、3级遮挡断裂及3级分支遮挡断裂的断层封堵性进行分析,建立“断层泥比率图版”(简称“SGR图版”),SGR图版值均大于0.4(图14a图14b),在SGR-SSF断层侧向封堵性定量图版中绝大多数断点位于“油气区”,证实断层封堵性较好[3]图15)。5级遮挡断裂对应的运移断裂为4级断裂或5级断裂,油气充注强度多数情况下不能运移至5级遮挡断裂主控的圈闭中,同时5级断裂断距小,泥岩涂抹作用差,导致其断层封堵性差,SGR图版值均较小(图14c),在SGR-SSF断层侧封定量图版中,5级遮挡断裂主控的圈闭多数分布在“水区”(图15)。
综合分析二号断裂带差异性断裂体系内部断裂系统与油气展布规律之间的关系,得到3方面断裂控藏规律及4种优势断裂控藏模式。
断裂控藏规律包括以下3方面。
(1)运移断裂模式为3级断裂运移能力优于3级分支断裂运移能力,优于3级、4级断裂组合运移模式(图16)。对于“坡坪式”断裂体系,油气沿着3级断裂沟源垂向运移,优先充注于通过3级断裂运移的构造圈闭,再沿着4级断裂将油气向“花心”运移,油气充注强度决定其能否到达“花心”位置(图17a)。对于“铲式”断裂体系,3级断裂沟源是油气运移的主要方式,4级断裂能否运移主要取决与断裂自身的封堵性,断层封堵性差,油气进入4级断裂垂向运移,断层封堵性好,油气在4级断裂遮挡的圈闭高点聚集成藏(图17b)。
(2)遮挡断裂最主要是4级遮挡断裂,其次是3级遮挡断裂和3级分支遮挡断裂,5级遮挡断裂成藏可能性小(图18)。4级遮挡断裂比重最高的原因是4级遮挡断裂为3级断裂次一级分支断裂,紧邻3级断裂,能够与相应3级断裂构成断鼻、断块圈闭(图17)。3级遮挡断裂、3级分支遮挡断裂分别能够与相邻的3级断裂、3级分支断裂构成断鼻、断块圈闭,成藏概率较高(图17)。
(3)二号断裂带油气集中分布在两雁列式主断裂间(3级断裂间)、主断裂分支断裂间(3级分支断裂间)、次一级断裂与雁列主断裂间(4级与3级断裂间)。二号断裂带中段所受地应力更强,断裂密度更大,主断裂形态多为坡坪式,构造应力作用导致断裂掀斜[25],产生“坡坪式”断裂体系,与两侧相比产生更多的4级断裂,形成4级遮挡断裂主控的圈闭,与3级运移断裂形成优势圈闭条件。
在断裂控藏规律研究的基础上,通过统计二号断裂带涠洲组已成藏圈闭运移断裂、遮挡断裂特征,总结了4种优势断裂控藏模式:4级断裂遮挡、3级分支断裂运移模式,3级分支断裂遮挡、3级断裂运移模式,4级断裂遮挡、3级断裂运移模式,3级断裂遮挡、3级断裂运移模式,在潜力目标搜索过程中具有指导意义(图19)。
目前,二号断裂带多个油田产量开始下降,且储采比低,亟需寻找储量接替,但是受限于平台无井槽、无注水设施,需要通过一定储量规模来推动平台外挂井槽。在断裂控藏规律及断裂控藏模式的指导下,在成藏条件更为优越的二号断裂带中段开展技术应用,优选北1块、北3块、北4块进行评价(图20)。
北1块解释、落实了涠二段W2Ⅱ、W2Ⅲ、W2Ⅳ、W2Ⅵ油组共4层圈闭,圈闭形态好。涠二段圈闭为反向断层遮挡的断块圈闭,遮挡断裂F2为3级优势遮挡断裂模式,运移断裂F1为3级优势运移模式,属于3级断裂遮挡、3级断裂运移的优势断裂控藏模式,预测成藏概率高。遮挡断裂断层封堵性分析显示主要目的层断层封堵性好,成藏概率高。部署N1-3d开发评价井对北1块进行快速评价,该井在W2Ⅱ、W2Ⅳ油组钻遇油层,证实该断裂控藏组合模式优越,区域涠二段油气运移活跃,可以作为下步目标搜索的有利方向。
北3块解释、落实了W3Ⅰ、W3Ⅳ、W3Ⅵ、W3Ⅸ、W3Ⅻ油组共5层圈闭,圈闭形态好,为反向断层遮挡的断块圈闭,遮挡断裂F4为4级优势遮挡断裂模式,运移断裂2号断裂带为3级优势运移模式,属于4级断裂遮挡、3级断裂运移的优势断裂控藏模式,预测成藏概率高。针对主控断裂断层封堵性进行分析,W3Ⅰ、W3Ⅳ、W3Ⅸ、W3Ⅻ油组断层封堵性好,成藏概率高,W3Ⅵ油组断层封堵性差,成藏存在一定风险。部署N3-10 d开发评价井进行快速评价,该井在W3Ⅳ、W3Ⅵ、W3Ⅸ、W3Ⅻ油组钻遇油层,W3Ⅰ、W3Ⅸ、W3Ⅹ、W3Ⅻ油组钻遇油水同层,油层厚度50.8 m/7层,含油水层89.2 m/7层,钻探效果好。
北4块解释、落实了W3Ⅷ、W3Ⅸ、W3Ⅻ油组共3层圈闭,圈闭形态好,为反向断层遮挡的断块圈闭,遮挡断裂为4级优势遮挡断裂模式,运移断裂为3级优势运移模式,断裂控藏模式为4级断裂遮挡、3级断裂运移的优势断裂控藏模式,预测成藏概率高。部署N4-A8P调整井兼探W3Ⅷ、W3Ⅸ油组含油性,实钻W3Ⅷ油组钻遇10.8 m/1层油迹细砂岩,测井解释3.5 m油水层、5.2 m含油水层,W3Ⅸ油组钻遇14.5 m/2层荧光细砂岩,测井解释14.7 m/2层含油水层。由于W3Ⅷ、W3Ⅸ油组靶点位于构造低部位,因此,分析认为两个油组含油规模可观,计划在构造高部位部署1口开发评价井落实W3Ⅷ、W3Ⅸ油组含油性,加深兼探W3Ⅹ油组薄油层、W3Ⅻ油组潜力层,同时兼顾W3Ⅶ油组油层调整,若评价成功,直接转入生产,实现快速建产。
北1块、北3块及北4块实施均获得成功,达到钻前设计地质油藏目的,二号断裂带中段断裂控藏规律应用效果好。
(1)综合断裂动力学特征、断裂运动学特征、断裂几何学特征等研究,将二号断裂带“坡坪式”断裂体系、“铲式”断裂体系划分为3级雁列式主断裂、4级分支断裂、5级分支断裂。
(2)二号断裂带中段“坡坪式”断裂体系在更高强度地应力作用下,3级雁列式主断裂与4级、5级分支断裂更为发育,具有更为优越的油气运移及遮挡条件。二号断裂带主要含油层系流三段、流一段、涠三段、涠二段油气绝大多数分布在中段“坡坪式”断裂体系。
(3)3点断裂控藏规律:①运移断裂模式为3级断裂运移能力优于3级分支断裂运移能力,优于3级、4级断裂组合运移模式。②遮挡断裂模式为4级遮挡断裂成藏概率最高,其次是3级遮挡断裂和3级分支遮挡断裂,5级遮挡断裂成藏可能性小。③二号断裂带涠洲组油气集中分布在3级断裂间、3级分支断裂间、4级与3级断裂间。4种优势断裂控藏模式:4级断裂遮挡、3级分支断裂运移模式,3级分支断裂遮挡、3级断裂运移模式,4级断裂遮挡、3级断裂运移模式,3级断裂遮挡、3级断裂运移模式。
(4)在断裂控藏规律新认识的指导下,优选中段北1块、北3块、北4块进行评价。3个区块实施均获得成功,达到钻前设计地质油藏目的,二号断裂带中段断裂控藏规律应用效果好。
  • 国家科技重大专项“近海大中型油气田形成条件及勘探技术”(2016ZX05024-006)。
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2019年第41卷第7期
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doi: 10.3969/j.issn.0253-4193.2019.07.008
  • 接收时间:2019-01-23
  • 首发时间:2026-04-02
  • 出版时间:2019-07-25
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  • 收稿日期:2019-01-23
  • 修回日期:2019-04-04
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国家科技重大专项“近海大中型油气田形成条件及勘探技术”(2016ZX05024-006)。
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    1 中海石油(中国)有限公司湛江分公司,广东 湛江 524057
    2 中海石油(中国)有限公司油气储量办公室,北京 100010
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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