Shale-Gas Exploration Prospect of Lower Cambrian Mufushan Formation in the Northern Jiangsu,China
详细信息
- 责任者：Liu Xiaoping (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Pan Jiping
- 刊名：Journal of Chengdu University of Technology
- 出版年：2012
- 卷期：38(2)
- 页码：p.198-205
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
Based on the geological surveys in the field,core observation,historical well re-examination,analysis and testing,simulation experiment etc.,this paper analyses the organic geochemistry characteristics,reservoir characteristics and gas-bearing features of the rich-organic matter shale in Lower Cambrian Mufushan Formation of northern Jiangsu.The rich-in organic matter shale develops in the lower part of Mufushan Formation and is shelf-basin facies with a cumulative thickness generally of 50~200 m.The top depth is generally 2.5~4 km.The main kerogen types are I and II1.The shale has a high organic matter abundance.The an average of TOC is 3.32% and the maximum TOC is 12.1%.In the high heat evolutionary stage,the equivalent vitrinite reflectance is 0.73%~3.01% and averages 2.83%.The shale contains abundant clay minerals and quartz and a small amount of K-feldspar and gypsum.The main compositions of clay minerals are illite and I/S mixed layer,but the clay minerals do not contain smectite.Micropores and microcracks develop well in the shale reservoir.The isothermal adsorption simulating experiment shows that the shale has good gas absorbed capacity.It is estimated that the average shale-gas（free and absorbed gas） content of Mufushan Formation in the northern Jiangsu is 1.4 m^3/t,and the shale-gas resources amount is 1.8×10^8 m^3/km^2,which indicates a great shale-gas resources potential.According to the preliminary prediction,the favorable areas for shale-gas exploration of Mufushan Formation in northern Jiangsu are mainly distributed from Quanjiao in Anhui Province to Liuhe in Jiangsu Province and over the Yangzhou-Gaoyou-Xinghua area in Jiangsu Province.