中国石油勘探 ›› 2025, Vol. 30 ›› Issue (6): 134-152.DOI: 10.3969/j.issn.1672-7703.2025.06.010

• 石油地质 • 上一篇    

西湖凹陷中央反转带花港组构造—成岩控储机制研究

田安琦1,2,刘成林1,2,付金华3,黄导武4,刘创新4,霍宏亮1,2   

  1. 1 中国石油大学(北京)地球科学学院;2. 油气资源与工程全国重点实验室;3 中国石油长庆油田公司勘探开发研究院;4 中海石油( 中国) 有限公司上海分公司
  • 发布日期:2025-11-14
  • 作者简介:田安琦(1995-),女,黑龙江大庆人,中国石油大学(北京)在读博士,现主要从事油气地质与勘探科研工作。地址:北京市昌平区中国石油大学(北京),邮政编码:102249。
  • 基金资助:
    国家重点研发计划项目“富氦天然气成藏机制及氦资源分布预测技术”(2021YFA071900);国家自然科学基金项目“咸化湖盆条件下盐类对地层超压的作用机制研究”(41872127)。

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

Tian Anqi1,2,Liu Chenglin1,2,Fu Jinhua3,Huang Daowu4,Liu Chuangxin4,Huo Hongliang1,2   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China; 2. National Key Laboratory of Petroleum Resources and Engineering, Beijing 102249, China; 3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, 710018, China; 4. Shanghai Branch of CNOOC Ltd. , Shanghai, 200335
  • Published:2025-11-14

摘要: 西湖凹陷中央反转带花港组是东海盆地近年来油气勘探的重要目标,但受多期构造活动与成岩作用影响,储层非均质性强,优质储层成因尚不明确。本文以“B”构造为例,综合岩心、矿物组分、扫描电镜、高压压汞及成像测井数据,系统分析储层应力分布、裂缝发育特征及构造—成岩控储机制。研究区构造应力呈明显三段式分带:浅层为张应力主控,发育规则裂缝;中层应力扰动强烈,裂缝走向弥散;深层以剪压应力为主,裂缝集中且倾角大。不同构造部位(断裂核部、破碎带、围岩区)在应力集中、裂缝导通与成岩流体活动方面存在显著差异。综合构造应力及成岩作用的影响,将花港组储层划分为6类构造—成岩相,并明确了其平面展布特征。各类成岩相在断裂核部、破碎带与围岩区之间空间交替分布,其中优质储层多发育于裂缝导通性强、成岩体系开放的强溶蚀相区。总体而言,研究区储层非均质性源于构造应力、裂缝系统与成岩作用的多尺度耦合,构造—成岩相揭示了“应力主导—流体驱动—相带分异”的控储模式。研究结果为走滑断裂带优质储层预测与分带评价提供了地质依据。

关键词: 致密砂岩;构造—成岩相;走滑断裂;花港组;西湖凹陷

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

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