天然气勘探与开发2023，Vol.46Issue(4)：123-132,10.DOI:10.12055/gaskk.issn.1673-3177.2023.04.013
川中地区雷三2亚段"灰质岩类"储层主控因素及有利区预测
Influential factors and prospects of calcareous reservoirs of Lei32 submember,central Sichuan Basin
摘要
Abstract
An important breakthrough has been made in carbonate reservoirs of evaporate-platform lagoon facies through the explora-tion on the Middle Triassic Leikoupo Formation in central Sichuan Basin,which reveals a new prospective target,namely the second submember of the third member of Leikoupo Formation(Lei32 submember).So,through core and cuttings analysis,thin-section obser-vation,and well-to-seismic analysis,the main influential factors and prospects were figured out for calcareous reservoirs of this sub-member in central basin.Results show that(i)these Lei32 reservoirs are mainly composed of argillaceous limestone and limy mudstone developed with nano-to micron-sized inorganic pores,organic pores and microfractures;(ii)there is high porosity in some reservoirs with rich clay mineral or coexistence with gypsum,and the permeability is improved by fractures with effect;(iii)for this submember,the seismic facies were divided by using the thickness of gypsum-salt rock,and the crumple deformation zone was predicted by the thickness from Jialingjiang 4 to Jialingjiang 5 members.With an area of 4,000 km2,Xichong-Yingshan area featuring the overlap of aforementioned seismic facies and deformation zone is a favorable belt to develop with calcareous reservoirs;and(iv)the calcareous reservoirs can form massive self-generating and self-preserving unconventional reservoirs with gypsum-salt rock as the seal,and they will certainly be the realistic domain for oil and gas exploration in the Leikoupo Formation of Sichuan Basin.关键词
四川盆地中部/潟湖相/雷三2亚段/灰质岩类储层/储层主控因素/自生自储/地震相Key words
Central Sichuan Basin/Lagoon facies/Lei32 submember/Calcareous reservoir/Main influential factor/Self-generating and self-preserving/Seismic facies引用本文复制引用
张豪,辛勇光,徐唱,任纪博,田瀚,潘柯宇..川中地区雷三2亚段"灰质岩类"储层主控因素及有利区预测[J].天然气勘探与开发,2023,46(4):123-132,10.基金项目
中国石油天然气集团有限公司上游领域基础性前瞻性项目"残留型海相盆地构造—岩相古地理重建技术研究"(编号:2021DJ0501)、"海相碳酸盐岩有效储层形成与保持机理及分布预测研究"(编号:2021DJ0503). （编号:2021DJ0501）
