Tectono-diagenetic reservoir-controlling mechanisms of the Huagang Formation in the central inversion belt, Xihu Sag

doi:10.3969/j.issn.1672-7703.2025.06.010

Abstract

Abstract: The Huagang Formation in the central inversion belt of the Xihu Sag has been an important target for oil and gas exploration in the East China Sea Basin in recent years. However, due to the influence of multiphase tectonic activity and diagenesis, the reservoirs exhibit strong heterogeneity, and the genesis of high-quality reservoirs remains unclear. Taking Structure “B” as an example, this study integrates core observations, mineral composition analysis, scanning electron microscopy, high-pressure mercury intrusion, and imaging logging data to systematically analyze reservoir stress distribution, fracture development characteristics, and the tectono-diagenetic reservoir-controlling mechanism. The tectonic stress in the study area displays a distinct three-segment zonation: the shallow zone is dominated by extensional stress with regularly oriented fractures; the middle zone is characterized by intense stress disturbance and diffuse fracture orientations; and the deep zone is governed by compressive–shear stress, with concentrated fractures of large dip angles. Different structural positions (fault core, damage zone, and host rock) show significant differences in stress concentration, fracture connectivity, and diagenetic fluid activity. Considering the combined effects of tectonic stress and diagenesis, the Huagang Formation reservoirs are classified into six types of tectono-diagenetic facies, and their planar distribution characteristics are clarified. These facies alternate spatially among the fault core, damage zone, and host rock, with high-quality reservoirs predominantly developed in strongly dissolved facies zones characterized by high fracture connectivity and an open diagenetic system. Overall, reservoir heterogeneity in the study area results from the multi-scale coupling of tectonic stress, fracture systems, and diagenetic processes, and the tectono-diagenetic facies reveal a “stress-dominated – fluid-driven – facies belt differentiation” reservoircontrolling model. The results provide a geological basis for high-quality reservoir prediction and zonal evaluation in strike-slip fault zones.

Key words: Tight sandstone; Tectono-diagenetic facies; Strike-slip fault; Huagang Formation; Xihu Sag

CLC Number:

TE122.3

Tian Anqi, Liu Chenglin,Fu Jinhua,Huang Daowu,Liu Chuangxin,Huo Hongliang. Tectono-diagenetic reservoir-controlling mechanisms of the Huagang Formation in the central inversion belt, Xihu Sag[J]. China Petroleum Exploration, 2025, 30(6): 134-152.

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