Full
WANG Bin,born in 1981,is a Ph.D. and Senior Engineer. He is mainly engaged in sedimentary reservoirs and petroleum accumulation. E-mail: wangbin.syky@sinopec.com.
Outline
Tectonic-sedimentary co-evolution in continental faulted lacustrine basins controls the development of source-reservoir systems and the processes of hydrocarbon accumulation and enrichment. Through meticulous analysis of core samples,drilling and logging data,and interpretation of high-resolution 3D seismic data,this study clarifies the sedimentary system characteristics and facies distribution patterns in the Chagan sag during the rift stage,revealing the co-evolution mechanism between tectonic activities and sediment filling. The research identifies two third-order sequences within the rift stage: (1)During the initial rifting phase(SQ1),the NE-trending Maoxi Fault and NW-trending Tula’ge Fault evolved from segmented activation to radial linkage,creating a highly compartmentalized rift framework. This structural pattern controlled the development of proximal,short-axis alluvial fan-fan delta systems,while intense fault displacement combined with warm-humid climates promoted the formation of semi-deep to deep lacustrine facies.(2)In the intensive rifting phase(SQ2),the NE-trending basin-controlling fault system dominated the sedimentary framework: volcanic activity during the first sub-member of the Suhongtu Formation occupied accommodation space,leading to widespread shallow lacustrine facies,while intra-rift volcanic topography fragmented braided river delta sand bodies. During the second sub-member,rapid volcanic accumulation outpaced subsidence,causing source depletion along the northern Maoxi Fault and southern Hule Fault segments,and redirecting sediment supply from the west to the northwest along the northern Hule Fault,thereby altering sandbody filling patterns. Coupling between high-displacement faults and humid climates during SQ1 controlled the development of major source rocks. Volcano-tectonic interactions during SQ2 modified sedimentary paleotopography,regulating reservoir sandbody distribution(e.g.,volcanic barriers fragmenting sand bodies;rapid accumulation triggering source system migration). Volcanic interlayers with stratified vesicles form effective reservoirs when connected to deep hydrocarbon sources via fault systems. The tectono-sedimentary synergistic evolution model established in this paper can provide guidance for reservoir prediction and exploration deployment in the study area,and also offer an analog model for the analysis of fault-depression basins with similar geological settings.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 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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