成都理工大学学报（自然科学版）2016，Vol.43Issue(2)：129-152,24.DOI:10.3969/j.issn.1671-9727.2016.02.01
四川盆地深层微生物碳酸盐岩储层特征及其油气勘探前景
Characteristics of microbial carbonate reservoir and its hydrocarbon exploring outlook in the Sichuan Basin,China
摘要
Abstract
Microbial carbonates are a new type of hydrocarbon reservoir rocks.Microbial carbonates in the Sichuan Basin mainly distribute in the Upper Sinian Dengying Formation and the Middle Triassic Leikoupo Formation.The microbial carbonate reservoirs of the Dengying Formation mainly occur in the 2nd and 4th member of the formation (called simply Deng-2 and Deng-4 member)and they are of the same characteristics in the whole Sichuan Basin.The microbial carbonates of the Deng-2 are mainly thrombolite and prehnite,and those of the 4th member are mainly laminate and stromatolite. The main reservoir spaces of the Deng-2 are karst pores,botryoidalis pores,visceral pores of microorganism,pores in framework of microorganism,and thrombolite boundary dissolution pore, while those of the 4th member are mainly fenestrule and karst pores.It shows that the main depositional environments of the high-quality reservoirs of the Dengying Formation are tidal microbial flat controlled by microorganism in the shallow water,and the microbial structure is the main factor controlling the original difference of the microbial carbonate reservoir properties.Early Cambrian Mianyang-Changning intracratonic sag and Tongwan weathering crust karsts control the final distribution of the high-quality reservoir rocks.The research reveals that the main controlling factors of the high-quality microbial carbonate reservoir rocks in the Dengying Formation are microbial flat, dolomitization and weathering crust karstification.The microbial carbonates of the middle Triassic Leikoupo Formation mainly develops in the 4th member in the west Sichuan Basin,which is composed of stromatolite and thrombolite with fenestrule and visceral pores of microorganism as main reservoir spaces.Its main depositional environment is limited evaporation tide.Well developed microorganism leads to the formation of microbial reefs and beaches which determine the distribution of the high-quality reservoir rocks.The main controlling factors of the high-quality microbial carbonate reservoir rocks in the Leikoupo Formation are microbial reefs (beaches ), dolomitization and deep-bury karstification.Large-scale gas fields have been discovered in the microbial carbonates of both the Dengying Formation and the 4th member of the Leikoupo Formation in the Sichuan Basin.The middle-northern part of the west Sichuan Basin is one of the most favorable areas for exploring hydrocarbon in the deep and ultra-deep marine carbonates.关键词
微生物碳酸盐岩/灯影组/雷口坡组/凝块石/叠层石/储层特征/四川盆地Key words
microbial carbonate/Dengying Formation/Leikoupo Formation/stromatolite/thrombolite/reservoir characteristics/Sichuan Basin分类
能源科技引用本文复制引用
刘树根,余永强,龙翼,万元博,宋金民,罗平,QING Hairuo,林彤,孙玮,李智武,王浩,彭瀚霖..四川盆地深层微生物碳酸盐岩储层特征及其油气勘探前景[J].成都理工大学学报（自然科学版）,2016,43(2):129-152,24.基金项目
中国地质调查局地质调查工作项目（编号1212011220761）。 （）
