Bitumen formation of Cambrian Longwangmiao Formation in the central Sichuan and its implication for hydrocarbon accumulation  

作　　者：Bin Hao Wenzhi Zhao Suyun Hu Shuyuan Shi Ping Gao Tongshan Wang Shipeng Huang Hua Jiang 

机构地区：[1]Northwest Branch,PetroChina Research Institute of Petroleum Exploration and Development,Gansu 730020,China [2]PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China [3]Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China

出　　处：《Petroleum Research》2018年第1期44-56,共13页石油研究（英文）

基　　金：The work was supported by the National Research Council of Science and Technology Major Project(No.2011ZX05004-001).

摘　　要：Based on organic petrology,organic geochemistry and SEM method,type,formation period and source of bitumens in the Cambrian Longwangmiao Formation in the central Sichuan Basin were well investigated,and combined with fluid inclusions and tectonic evolution characteristics,the hydrocarbon accumulation history of the gas reservoir of the Longwangmiao Formation in the Anyue gasfield was also studied.The result shows that all bitumens in the Longwangmiao Formation was from the Lower Cambrian source rocks,it had multiple genetic types which was dominated by the pyrolysis genetic type;the bitumens were formed into three stages,i.e.,the bitumen of the oxidized water-washing type in the first stage,the bitumen of the precipitated type in the second stage,and the bitumen of the pyrolyzed type in the third stage;the gas reservoir in the Anyue gasfield experienced five stages of hydrocarbon charging,including two stages of liquid hydrocarbon charging,charging of the kerogen pyrolysis gas in the Late Triassic-Early Jurassic,charging of the crude oil pyrolysis gas in the Late Jurassic-Early Cretaceous and charging of the dry gas charging in the Himalayan trap reformation and adjustment process.

关 键 词：BITUMEN Biomarker Authigenic minerals INCLUSION Hydrocarbon charging Longwangmiao Formation Central Sichuan 

分 类 号：P61[天文地球—矿床学]