石油实验地质Issue(6)：596-600,656,6.DOI:10.11781/sysydz201306596
川东北元坝区块中下侏罗统页岩油气地质分析
Geologic analysis of Middle-Lower Jurassic shale reservoirs in Yuanba area, northeastern Sichuan Basin
摘要
Abstract
Integrating with drillings, cores, outcrops and logging data, we made a comprehensive geologic analy-sis of the Middle-Lower Jurassic shale reservoirs in the Yuanba area of the northeastern Sichuan Basin, from the aspects such as organic-rich shale distribution, geochemical characterization, mineral composition, hydrocarbon store space property, shale porosity and permeability condition, and geomechanical nature. The organic-rich shales mainly generated from the Daanzhai member of the Ziliujing Formation to the 1st and 2nd members of the Qianfoya Formation. They are shallow to semi-deep lacustrine facies, and mainly consist of dark shales with limes and sand stones. Organic matters are rich, and of type Ⅱ2 . The average TOC content is 1. 14%. The vitrinite reflectance (Ro) ranges from 1.4% to 1.6%, indicating for the mature and high-mature stages of condensate oil and wet gas. Generally, the Middle-Lower Jurassic shales have simple and stable structure with few fractures developed, hence are favorable for hydrocarbon generation and preservation. The lacustrine facies shales in the Daanzhai member are similar to the Eagle Ford shales in the North America in general. The dark shales in the Daanzhai member are 40-115 m thick with various pore types. Horizontal and micro fractures are well-developed. The average brittle mineral content, Young’ s modulus and Poisson ratio are 52.7%, 37 GPa and 0.30, respec-tively, all contributing to the formation of fracture network.关键词
有机质/页岩油气/储集层/中下侏罗统/元坝地区/川东北Key words
organic matter/shale oil gas/reservoir/Middle-Lower Jurassic/Yuanba area/noortheastern Sichuan分类
能源科技引用本文复制引用
周德华,焦方正,郭旭升,郭彤楼,魏志红..川东北元坝区块中下侏罗统页岩油气地质分析[J].石油实验地质,2013,(6):596-600,656,6.基金项目
中国石化科技部项目（ P12001）资助。 （）
