碳酸盐台内斜坡认识突破与重大发现——以川中地区中二叠统茅口组二段气藏勘探为例

doi:10.3969/j.issn.1672-7703.2023.01.006

摘要/Abstract

摘要： 目前川中古隆起规模性勘探发现主要集中在深部震旦系—寒武系的高能滩相，中部二叠系处于台内斜坡相，以低能环境为主，勘探未受重视。为了进一步落实川中地区中二叠统气藏富集规律，通过岩心描述、薄片分析、U—Pb 测年与印模法古地貌恢复等手段，开展岩相古地理、储层成因及成储模式与气藏特征分析，对全盆地茅口组二段（茅二段）进行了重新认识。结果表明：（1）四川盆地茅二段发育南带、中带与北带3个北西向古地貌高带，川中地区处于南部古地貌高带中南部，发育规模滩体；（2）茅二段古地貌高带控制了沉积期滩体分布以及准同生期的岩溶、白云岩化作用，据此构建了川中地区茅二段白云岩储层发育模式，认为川中地区茅二段发育大面积优质白云岩储层；（3）创新建立茅二段薄层白云岩地震预测技术，古地貌高带控制了茅二段优质白云岩储层分布与气藏的高产富集。新认识带来勘探领域新突破，指导部署的潼深4井等5口井试气获超百万立方米高产，实现了四川盆地茅二段台内天然气勘探的重大突破，提交探明储量超千亿立方米。目前，川中地区茅二段气藏已成为“十四五”期间提交天然气探明储量的重要领域。

关键词: 四川盆地, 川中地区, 茅二段, 储层成因, 古地貌, 白云岩, 岩性气藏

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.

中图分类号:

TE112

何文渊, 白雪峰, 蒙启安, 王显东, 田小彬, 鞠林波. 碳酸盐台内斜坡认识突破与重大发现——以川中地区中二叠统茅口组二段气藏勘探为例[J]. 中国石油勘探, 2023, 28(1): 59-70.

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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