Main controlling factors of the Middle Permian dolomite reservoir and prediction of exploration zone in Tongnan-Hechuan block, Sichuan Basin

doi:10.3969/j.issn.1672-7703.2022.04.011

Abstract

Abstract: In recent years, in addition to the western and southern Sichuan Basin, dolomite reservoirs of the Middle Permian Qixia Formation-Maokou Formation have been penetrated in multiple wells in Tongnan-Hechuan block in the central Sichuan Basin and high production has been achieved, showing promising exploration potential in the central Sichuan Basin. However, there is little understanding on Qixia Formation-Maokou Formation in the central Sichuan Basin from previous study, and great disputes appear on the genesis and distribution of dolomite reservoirs. The latest petroleum exploration results and a large number of basic data are analyzed to identify the stratigraphic distribution, sedimentary and reservoir characteristics, especially the main controlling factors of the high-quality dolomite reservoir. The results show that: (1) Qixia Formation-Maokou Formation in Tongnan-Hechuan block is divided into two third-order sequences and six fourth-order sequences, and the high-quality dolomite reservoir is developed in the highstand system tract. (2) The sedimentary facies of Qixia Formation-Maokou Formation in Tongnan-Hechuan block was conducive to the deposition of granular beach, with a large number of bioclastic beach developed. The dolomite reservoir was mainly developed in high-energy beach facies zone. (3) The single layer of dolomite reservoir of Qixia Formation is thin and vertically superimposed, while that of Maokou Formation is greater and continuous in lateral. The reservoir space is dominated by primary pores and quasi syngenetic dissolution pores. The development of dolomite reservoir is mainly controlled by highenergy granular beach, sequence related karstification and early dolomitization. (4) The dolomite reservoir of Qixia Formation is mainly distributed in the circum subsag and the western part of Tongnan-Hechuan block is a favorable exploration zone. The dolomite reservoir of Maokou Formation is mainly developed in the edge slope of micro paleogeomorphologic high area and the northeast side of Well Heshen 4 is the most favorable exploration zone.

CLC Number:

TE112.2

Zhu Mao, Huang Shiwei, Song Xu, Wang Xiandong, Shi Jiangbo, Tian Xiaobin, Yao Qianying, Wang Hui. Main controlling factors of the Middle Permian dolomite reservoir and prediction of exploration zone in Tongnan-Hechuan block, Sichuan Basin[J]. China Petroleum Exploration, 2022, 27(4): 149-161.

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