冀中坳陷奥陶系深层白云岩储集层成因机制

doi:10.7657/XJPG20240604

摘要/Abstract

摘要：

深层潜山内幕储集层是冀中坳陷重要的油气接力区，明确其成因机制对油气勘探开发尤为重要。通过钻井、测井、露头、岩心、薄片等资料，揭示了奥陶系深层白云岩储集层特征，分析其主控因素，并建立了优质储集层成因演化模式。结果表明：冀中坳陷奥陶系发育3套优质储集层带，岩性以结晶白云岩及石灰质白云岩为主，储集层非均质性强，孔渗相关性差，发育晶间孔、溶蚀孔、溶洞和裂缝4类储集空间；白云石化、溶蚀和构造破裂是建设性成岩作用，压实、胶结充填、去白云石化、黄铁矿化和硅化为破坏性成岩作用；周期性海平面变化影响下的沉积和白云石化是储集层形成的基础，成岩演化序列决定孔隙演化的3个阶段，构造运动主导了储集层的改造，储集层共经历了4个演化阶段，形成了深埋潜山型及斜坡型优质白云岩储集层。

关键词: 渤海湾盆地, 冀中坳陷, 奥陶系, 白云岩储集层, 成岩作用, 控制因素, 演化模式

Abstract:

The deep buried-hill interior reservoirs in the Jizhong depression are key successive zones for oil and gas exploration, and clarifying their genetic mechanisms is particularly important for effective exploration and development. Based on the data of drilling, logging, outcrops, cores, and thin sections, the deep Ordovician dolomite reservoirs were characterized, their controlling factors were analyzed, and the evolution models of high-quality reservoirs were established. The research results show that three sets of high-quality reservoirs are developed in the Ordovician of the Jizhong depression. These reservoirs which are primarily composed of crystalline dolomite and limy dolomite exhibit strong heterogeneity and poor porosity-permeability correlation. Four types of reservoir spaces including intercrystalline pores, dissolved pores, karst caves, and fractures are found in the reservoirs. Dolomitization, dissolution, and tectonic fracturing are identified as constructive diagenetic processes, whereas compaction, cementation, dedolomitization, pyritization, and silicification are classified as destructive diagenetic processes. Sedimentation controlled by periodic sea-level changes and dolomitization provided material basis for the reservoir formation. The diagenetic sequence determined the three stages of pore evolution. Tectonic activities played a dominant role in reservoir reformation. Ultimately, the deep buried-hill type and slope type high-quality dolomite reservoirs were formed after four evolutionary stages.

Key words: Bohai Bay basin, Jizhong depression, Ordovician, dolomite reservoir, diagenesis, controlling factor, evolution model

中图分类号:

TE112.3

向鹏飞, 季汉成, 汪新伟, 史燕青, 黄芸, 孙予舒. 冀中坳陷奥陶系深层白云岩储集层成因机制[J]. 新疆石油地质, 2024, 45(6): 659-670.

XIANG Pengfei, JI Hancheng, WANG Xinwei, SHI Yanqing, HUANG Yun, SUN Yushu. Genetic Mechanisms of Deep Ordovician Dolomite Reservoirs in Jizhong Depression[J]. Xinjiang Petroleum Geology, 2024, 45(6): 659-670.

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