Genetic Mechanisms of Deep Ordovician Dolomite Reservoirs in Jizhong Depression

doi:10.7657/XJPG20240604

Abstract

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

CLC Number:

TE112.3

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.

Figures/Tables 9

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