New understanding and significant discovery in the inner slope of carbonate platform: a case study of gas exploration in the second member of Maokou Formation in Central Sichuan Basin

doi:10.3969/j.issn.1672-7703.2023.01.006

Abstract

Abstract: At present, large-scale discoveries in Central Sichuan paleo-uplift are mainly concentrated in the deep Sinian-Cambrian system of high-energy beach facies, while the exploration of the Permian is ignored by considering that it was generally developed in low-energy environment of intraplatform slope facies. In order to further identify the enrichment law of gas reservoirs in the Middle Permian in Central Sichuan Basin, the lithofacies paleogeography, reservoir genesis, reservoir development pattern and gas reservoir characteristics are analyzed by means of core description, thin section analysis, U-Pb dating and ancient landform restoration (impression method), and the second member of Maokou Formation (hereinafter referred to as Mao 2 member) is re understood at the basin level. The study results show that: (1) Three NW trending paleo high zones were developed in Sichuan Basin during the deposition period of Mao 2 member, namely, the southern zone, the middle zone and the northern zone. Central Sichuan Basin was located in the central-southern part of the southern paleo high zone and largescale beach body was developed; (2) The paleo high zones controlled the distribution of beach body, karstification in the penecontemporaneous period and dolomitization of Mao 2 member. On this basis, the reservoir development pattern is constructed, which indicates that high-quality dolomite reservoirs were widely developed in Mao 2 member in Central Sichuan Basin; (3) The seismic prediction technology of thin bedded dolomite of Mao 2 member is innovatively established, which shows that the distribution of high-quality reservoirs and the enrichment and high yield of gas reservoir in Mao 2 member were controlled by the paleo high zone. As a result, breakthroughs were obtained in the new exploration field guided by new geological understanding, achieving high gas flows of more than one million cubic meters during the test of five wells (including Well TS4), and marking a major breakthrough in gas exploration of Mao 2 member in Sichuan Basin, with the submitted proven gas reserves of exceeding 100 billion cubic meters. Now, the gas reservoir in Mao 2 member in Central Sichuan Basin is a major resource base for increasing proven reserves during the 14th Five-Year Plan period.

CLC Number:

TE112

He Wenyuan, Bai Xuefeng, Meng Qi’an, Wang Xiandong, Tian Xiaobin, Ju Linbo. New understanding and significant discovery in the inner slope of carbonate platform: a case study of gas exploration in the second member of Maokou Formation in Central Sichuan Basin[J]. China Petroleum Exploration, 2023, 28(1): 59-70.

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