四川盆地海相碳酸盐岩天然气勘探进展与方向

doi:10.3969/j.issn.1672-7703.2020.03.005

摘要/Abstract

摘要： 四川盆地海相碳酸盐岩经历长年沉积，天然气资源量为14.33×1012m3，资源丰富，居全国首位，是寻找规模优质储量的重要勘探领域。近年来，中国石油西南油气田公司坚持寻找规模优质储量、发现大中型气田的勘探主线，通过强化大型控藏古地质单元的识别和评价，不断深化地质理论认识，突出规模优质储层展布精细刻画、山前复杂构造带精细构造建模、大型构造斜坡区及低部位的成藏特征研究，依托地质—地球物理—工程等专业多方位联合技术进步，加大新区、新领域的勘探评价力度，形成川中安岳气田震旦系灯四段台内精细勘探理论、川西地区上古生界深层海相碳酸盐岩成藏理论，取得川中北部地区海相多层系立体成藏立体勘探等重要勘探新成果和新认识，高效推动四川盆地海相碳酸盐岩天然气储量稳定快速增长。基于勘探新成果与新认识有效评价盆地其他区块勘探潜力区带，综合分析认为德阳—安岳古裂陷周缘震旦系、环川中古隆起寒武系、川西北部地区上古生界多期台缘带是下一步寻找规模发现的战略领域，环海槽（台洼）周缘飞仙关组、川西—川中地区雷口坡组是持续深化勘探的重要领域。

关键词: 四川盆地, 海相碳酸盐岩, 勘探进展, 油气资源, 潜力区带

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.

中图分类号:

杨雨, 文龙, 谢继容, 罗冰, 黄平辉, 冉崎, 周刚, 张玺华, 汪华, 田兴旺, 张亚, 陈聪. 四川盆地海相碳酸盐岩天然气勘探进展与方向[J]. 中国石油勘探, 2020, 25(3): 44-55.

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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