Fault Characteristics and Influences on Jurassic Reservoirs in the Yanwu Area, Ordos Basin

doi:10.7657/XJPG20250309

Abstract

Abstract:

A number of Jurassic reservoir groups have been discovered in the southern part of the Tianhuan depression in the Ordos Basin, highlighting significant oil and gas exploration potential. Taking the Yanwu area as an example, by integrating the data of 3D seismic, drilling, core, and production performance, the fault characteristics were investigated, and the controls of these faults on the Jurassic Yan’an formation reservoir were analyzed. The results indicate that the Mesozoic in the Yanwu area develops three groups of major faults trending in NW-SE, NEE-SWW, and nearly E-W, which are primarily sub-vertical strike-slip faults featured with lateral zonation and vertical stratification. The NW-SE faults in the Triassic Yanchang formation were formed during the Indosinian Movement. The NEE-SWW and nearly E-W faults in the Jurassic Yan’an formation were mainly formed during the Yanshanian Movement, with the highest fault density in the Jurassic, and some discontinuous minor faults connected and extended through the Late Yanshanian to Himalayan to create the main fault belt. The NEE-SWW strike-slip faults vertically communicate source rocks and reservoir rocks, facilitating hydrocarbon migration and accumulation in the Jurassic. The trap-controlling faults near the main displacement zone, which exhibit large fault throws, resulted in hydrocarbon escape during multiple phases of activity, compromising reservoir preservation. Fractures are developed at fault ends or in overlapping zones. These fault-related fractured reservoir may suffer water front advancing, significantly impacting waterflooding effect in the reservoirs.

Key words: Ordos Basin, Yanwu area, Jurassic, strike-slip fault, fault-related fractured reservoir, pathway system, reservoir-controlling effect

CLC Number:

TE122

LONG Shengfang, HOU Yunchao, ZHAO Yuhua, ZHANG Jie, HAO Jinxin, GU Zhaoxing. Fault Characteristics and Influences on Jurassic Reservoirs in the Yanwu Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(3): 329-337.

Figures/Tables 8

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