Vertical Layered Structure of Shunbei No.5 Strike-Slip Fault Zone and Its Significance on Hydrocarbon Accumulation

doi:10.7657/XJPG20210204

Abstract

Abstract:

As the largest strike-slip fault zone in Shunbei area, Shunbei No. 5 structure is vertically layered and deformed, and has been proved to play an important role in controlling fault-karst reservoirs. The study carried out the interpretation of 3D seismic data of the Shunbei No.5 strike-slip fault zone, analyzed its structure, and established vertical layered structure models to clarify the controsl of the strike-slip fault zone on reservoir development and hydrocarbon migration and accumulation. The results show that: (1)The Shunbei No.5 strike-slip fault zone can be divided into four layers in the vertical direction, namely a Cambrian sub-gypsum fault system, a Cambrian gypsum-related fault system, an Ordovician carbonate fault system, and an Ordovician-Carboniferous clastic fault system; (2)The difference between stratum mixing competence is the basic condition of the layered deformation, and the staged activities of strike-slip faults caused by the changes of regional tectonic movement is the primary reason for the layered deformation; (3)The vertical layered structure of the strike-slip fault zone controls the hydrocarbon migration and accumulation: the sub-gypsum faults control the distribution of source rocks, the faults penetrating gypsum interval control hydrocarbon migration, the faults inside the Ordovician carbonate rock control the scale and connectivity of reservoirs, and the faults inside the Late Ordovician-Carboniferous clastic rock control hydrocarbon accumulation. According to the strength of the strike-slip fault movement, the strike-slip fault zone can be classified into three categories such as strong activity and dominant superimposition, strong activity and differential superimposition, and weak activity and weak superimposition.

Key words: Tarim basin, Shunbei area, Shunbei No.5 strike-slip fault zone, vertical layered structure, structural style, fault-karst reservoir

CLC Number:

TE122.14

HAN Jun, KUANG Anpeng, NENG Yuan, HUANG Cheng, LI Qiqi, CHEN Ping, SHEN Zhuoyi. Vertical Layered Structure of Shunbei No.5 Strike-Slip Fault Zone and Its Significance on Hydrocarbon Accumulation[J]. Xinjiang Petroleum Geology, 2021, 42(2): 152-160.

Figures/Tables 6

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