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- Title
塔东地区下寒武统泥页岩特征与页岩气有利区优选.
- Authors
龚训; 李洪辉; 张君龙; 王延斌; 徐兆辉; 赵石虎; 秦连彬
- Abstract
The development background, geochemical characteristics, reservoir physical and gas bearing characteristics and preservation conditions of Cambrian marine source rocks in Tadong area of Tarim Basin are studied by means of drilling coring and logging methods, combined with maceral identification, organic carbon analysis, rock pyrolysis, vitrinite reflectance test, whole rock mineral analysis, uniaxial compression and porosity permeability test. The favorable area is predicted. The results show that the organic macerals of Cambrian Xi⁃ dashan-Xishanbulake shale in Tadong area are characterized by rich marine vitrinite and high organic carbon content. The main types of organic matter are type I and type II1. The vitrinite reflectance is relatively moderate. The organic matter is in the high mature to over mature stage, and the thermal evolution lasts for a long time. It is found that the structural conditions in this area are not conducive to the preservation of shale gas. The gas con⁃ tent and organic carbon content are the two main controlling factors of the shale gas resources by using the grey correlation method and the weight analysis method. Based on the relevant parameters of the shale, the favorable shale gas area in the Tadong low uplift area is predicted, and two core areas and one favorable area are divided. The development background, geochemical characteristics, reservoir physical properties and gas bearing characteristics of Cambrian marine source rocks in Tadong area of Tarim Basin are studied by using drilling coring and logging methods, combined with maceral identification, organic carbon analysis, rock pyrolysis, vitrinite reflectance test, whole rock mineral analysis, uniaxial compression and porosity permeability test, and the favorable shale gas areas are also studied forecast. The results show that the organic macerals of Cambrian Xidashan-Xishanbulake formations shale in Tadong area are characterized by rich marine vitrinite and high organic carbon con⁃ tent. The types of organic matter are mainly type Ⅰ and Ⅱ1. The vitrinite reflectance is moderate. The organic matter is in the stage of high maturity and over maturity.The characteristics of long thermal evolution, high content of brittle minerals and well-developed porosity and permeability are also found. The physical properties are poor condition, large elastic modulus and small Poisson's ratio. Based on the conclusion, this paper uses the grey correlation method and weight analysis method to determine that gas content and organic carbon content are the two main controlling factors of the shale gas resources. Based on the relevant parameters of the shale, the favorable shale gas area in Tadong low uplift area is predicted, and two core areas and one favorable area are divided.
- Subjects
POISSON'S ratio; SHALE gas; OIL shales; GAS-lubricated bearings; ROCK analysis; VITRINITE
- Publication
Natural Gas Geoscience, 2021, Vol 32, Issue 6, p899
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.01.007