天然气工业2018，Vol.38Issue(1)：10-20,11.DOI:10.3787/j.issn.1000-0976.2018.01.002
四川盆地中二叠统天然气地质特征与勘探方向
Geological characteristics and exploration orientation of Mid-Permian natural gas in the Sichuan Basin
摘要
Abstract
In the Sichuan Basin,the less-proved natural gas resources in the Mid-Permian strata are highly potential for exploration.In this paper,sedimentary and reservoir characteristics of Mid-Permian natural gas in the basin were analyzed.On this basis,researches were conducted on hydrocarbon supply,reservoir and trap types,preservation conditions,structure,and phases and patterns of hydrocarbon accumulation to highlight the controlling factors for the enrichment of Mid-Permian natural gas in the basin and the orientation of future exploration operations.Research results are as follows.First,the Mid-Permian natural gas reservoirs in the Sichuan Basin are characterized by multiple sources from different layers,existence of reservoirs and traps of various types,formation of different reservoirs at different stages and other features.Second,hydrocarbon source rocks are predominantly in the Permian strata.There are also some hydrocarbon source rocks in the Lower Cambrian Qiongzhusi and Lower Silurian Longmaxi Fms.The gas-generation center of Mid-Permian Fms lies in the northwestern and central-southern parts of the Sichuan Basin.With a gas-generation intensity of 26× 108-44× l08 m3/km2,it has the necessary material basis available for the formation of large-or medium-sized gas fields.Third,the Mid-Permian strata contain dolomite and karst fractured-vuggy limestone reservoirs,with the former distributed predominantly in grain beach or around basement faults,and the latter distributed extensively in middle and upper parts of the Maokou Fm.Fourth,the presence of high-quality hydrocarbon source rocks,and dolomitization and epigenetic karstification of reservoirs are controlling factors for the distribution of large-and medium-sized gas fields.Fifth,the Indosinian paleo-uplifts are favorable zones for the accumulation of hydrocarbons,and the Himalayan is the key period of oil and gas adjustment.In conclusion,in the Mid-Permian Qixia Fm,the favorable exploration zones are represented by platform margin beaches mainly along the Guanyuan-Jiangyou and Dujiangyan areas in the NW Sichuan Basin,followed by platform margins in the SW Sichuan Basin,and intraplatform beaches predominantly in the Gaoshiti-Moxi area in the central and southern Sichuan Basin.Besides,in the Mid-Permian Maokou Fm,the favorable exploration zones are mainly the Luzhou-Neijiang area,followed by the Shuangyushi-Nanchong,Wolonghe-Shizhu,Gaoshiti-Moxi,Dazhou-Kaijiang,Jiulongshan and other areas.关键词
四川盆地/中二叠世/栖霞组/茅口组/白云岩/储集层/烃源岩/岩溶储层/气藏特征/天然气富集规律/勘探方向Key words
Sichuan Basin/Mid-Permian/Qixia Fm/Maokou Fm/Dolomite/Reservoir formation/Hydrocarbon source rocks/Karst reservoir/Gas reservoir characteristics/Natural gas enrichment/Exploration orientation引用本文复制引用
张健,周刚,张光荣,李国辉,汪华..四川盆地中二叠统天然气地质特征与勘探方向[J].天然气工业,2018,38(1):10-20,11.基金项目
国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05004-005、2016ZX05007-004)、中国石油天然气集团公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(编号:2016E-06、2016E-0602、2016E-0603、2016E-0604). （编号:2016ZX05004-005、2016ZX05007-004）
