Progress and direction of marine carbonate gas exploration in the Sichuan Basin

doi:10.3969/j.issn.1672-7703.2020.03.005

Abstract

Abstract: The Sichuan Basin experienced a long period of continuous marine carbonate deposition. The basin has rich natural gas resources of 14.33?1012 m3, which ranks first in China. It is an important exploration field for discoveries, with large-scale and high-quality reserves. In recent years, PetroChina Southwest Oil & Gasfield Company has concentrated its main exploration efforts on discovering large-scale and high-quality reserves and looking for large and medium-sized gas fields. By focusing on the identification and evaluation of large-scale paleo-geological units controlling hydrocarbon accumulation, the company has continuously deepened understandings of geological theory, strengthened research in areas such as fine characterization of distribution of large-scale and high-quality reservoirs, fine structural modeling of piedmont complex structural zones, and hydrocarbon accumulation characteristic research of large-scale structural slope areas and low areas. Relying on the multi-disciplinary joint technical progress of geology, geophysics and engineering, exploration and evaluation efforts in new areas and new fields have been increased, and important new exploration achievements and new understandings have been obtained. These include: the fine exploration theory of inner-platform in the 4th member of the Dengying Formation in the Sinian system in the Anyue gas field in the central Sichuan Basin, the hydrocarbon accumulation theory of the Upper Paleozoic deep marine carbonate reservoir in the western Sichuan area, and the stereoscopic hydrocarbon accumulation and stereoscopic exploration of multiple marine formations in the northern areas of the central Sichuan Basin. These achievements have promoted the stable and rapid growth of gas reserves in marine carbonate rocks in the Sichuan Basin. Based on these new exploration achievements and understandings, potential exploration zones in other blocks of the Sichuan Basin have been effectively evaluated. According to comprehensive analysis, the Sinian System in the periphery of the Deyang-Anyue paleorift, the Cambrian System in the paleo-uplift around the central Sichuan Basin, and the multi-stage platform margin of the Upper Paleozoic in the northern area of west Sichuan are strategic areas for future large-scale discoveries. The Feixianguan Formation around the trough (platform sag) and the Leikoupo Formation in the western-central Sichuan areas are important areas for continuously deepening exploration.

CLC Number:

Yang Yu, Wen Long, Xie Jirong, Luo Bing, Huang Pinghui, Ran Qi, Zhou Gang, Zhang Xihua, Wang Hua, Tian Xingwang, Zhang Ya, Chen Cong. Progress and direction of marine carbonate gas exploration in the Sichuan Basin[J]. China Petroleum Exploration, 2020, 25(3): 44-55.

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