Main controlling factors of hydrocarbon accumulation and enrichment in the southern slope of Chexi sag

被引：0
|
作者：
Wan T. [1 ]
Jiang Y.-L. [1 ]
Lin H.-X. [2 ]
Peng C.-S. [2 ]
Bi C.-Q. [2 ]
机构：
[1] College of Geo-Resources and Information in China University of Petroleum
[2] Geological Scientific Research Institute of Shengli Oilfield
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2010年 / 34卷 / 06期
关键词：
Chexi sag; Fault-seal; Oil domain; Pore throat radius; Source faults; Surplus pressure;
D O I：
10.3969/j.issn.1673-5005.2010.06.007
中图分类号：
学科分类号：
摘要：
Based on the data of geological logging, core mercury injection test and formation test, the quantitative analysis on the main controlling factors of hydrocarbon accumulation and enrichment in the southern slope of Chexi sag was studied by using technologies of quantitative evaluation of fault-activity and fault-seal, rock thin section analysis and reconstructed paleo pressure by basin modeling. The following are the conditions of fault-seal formation: The hydrocarbon accumulation degree and macroscopic distribution of reservoir upper source rock were controlled by the source faults' activity time and site of Guantao formation. Clay smear potential is more than 22, and shale smear factor is less than 1.5, and smear gouge ratio is more than 0.73. The bottom of Sha 2 member, Sha 3 and Sha 4 upper subinterval match the conditions. The hydrocarbon accumulation of reservoir under source rock is controlled by pore throat radius of reservoir and surplus pressure in the bottom of Sha 3 member during the period of reservoir formation. Favorable reservoir of Sha 4 upper subinterval is located in the area where the pore throat radius is more than 0.24μm and the buried depth of reservoir is less than 4 km and favorable sedimentary facies belt develops. Near the boundary of reservoir under source rock, surplus pressure and reservoir displacement pressure limitation in the phase of reservoir-forming are matched. Based on this, it can be predicted that the probable oil domain of reservoir under source rock is the stratum of late Minghuazhen formation sedimentary period (2 Ma before present) in the bottom of Sha 3 member whose surplus pressure is higher than 0.6 MPa.
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页码：38 / 44
页数：6
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