Controlling effect of NE strike slip fault system on reservoir development and hydrocarbon accumulation and its geological significance in the eastern #br#
Shunbei area, Tarim Basin

doi:10.3969/j.issn.1672-7703.2021.03.004

Abstract

Abstract: The fault system in Shunbei area has characteristics of “zonation between the east and west” bounded by Shunbei No.1
and No.5 faults, which play a transformation role between the east and west fault systems. On the plane, the NE trending Shunbei
No.1 fault is mainly composed of pull apart segment and translation segment, where the single well controls large area of oil reservoir,while the NW trending Shunbei No.5 fault is jointly formed by north and south segments. The north segment is dominated by compression stress with relatively small-scale oil reservoir controlled by single well. The seismic interpretation of No.4, No.8 and No.12 faults indicates that the NE fault system has a typical “three-segment” feature on the plane, with intensive fault activities and similar strike with the current regional principal stress. The overall reservoir scale is large and reservoir connectivity is good in each segment. In addition, high-quality source rocks of basin-middle and outer gentle slope facies were developed in the eastern Shunbei area. As a whole, the reservoir development and hydrocarbon accumulation conditions are superior than those of the NW fault system. Based on the above understandings, Wells Shunbei 42X, Shunbei 41X and Shunbei 8X were drilled, and high oil and gas flow rates of 1000 tons of oil equivalent obtained during well testing, indicating a new resource position of (400-500)-million-ton-level oil equivalent, which further proved that the NE strike-slip fault system has large reservoir scale, superior hydrocarbon accumulation conditions, and the characteristics of five-in-one “strike-slip fault system controlling the reservoir,trap, hydrocarbon migration, accumulation and enrichment”. The result can be used for reference to evaluate the strike slip fault of marine carbonate rocks in China.

Key words: Shunbei, NE strike-slip fault system, Fault controlling on reservoir and hydrocarbon accumulation, Five-in-one, Tarim Basin

CLC Number:

TE111.2

Yun Lu.

Controlling effect of NE strike slip fault system on reservoir development and hydrocarbon accumulation and its geological significance in the eastern #br# Shunbei area, Tarim Basin [J]. China Petroleum Exploration, 2021, 26(3): 41-52.

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Controlling effect of NE strike slip fault system on reservoir development and hydrocarbon accumulation and its geological significance in the eastern #br# Shunbei area, Tarim Basin

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