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- Title
Reservoir characteristic and gas exploration potential in Cambrian Xixiangchi Formation of Sichuan Basin.
- Authors
Shu-yuan SHI; Tong-shan WANG; Wei LIU; Hua JIANG; Qiu-fen LI; Xin LIU; Yi-yang ZENG; Xiang ZOU; Li HU
- Abstract
The content of gypsum salt rock in Cambrian drilling in Sichuan Basin is counted. The distribution of gypsum salt rock is characterized by combining logging and seismic data. The Cambrian developed area of Sichuan Basin is divided into the undeveloped area of gypsum salt rock mainly in the ancient uplift and slope area of Leshan-Longnusi and the developing area of gypsum salt rock mainly in the area of Chuandong-Shunan. The observation and description of core and thin-section reveal that the main types of reservoir rocks are dolograinstone and dolopackstone. The reservoir space includes three categories and nine subcategories: pore type, cave type and fracture type, and the cavern type is the main type. Physical properties test show that the porosity of core is below 2% and the reservoir is above 3% in non-gypsum developed area. The core porosity is 3.5% on average and up to 5% in the development area of gypsum salt rock. Microfacies are the basis of reservoir development in the Xixiangchi Formation, and grainstone beach is the main microfacies type. The atmospheric fresh water karst is the main controlling factor for the formation of high quality reservoir in undeveloped area of gypsum salt rock. The superimposition of burial dissolution is the key to the formation of high quality reservoir in developed area of gypsum salt rock. The potential of oil and gas exploration in Xixiangchi Formation is prospected. The paleo uplift and slope area of undeveloped gypsum salt rock should be based on searching for high-quality beach reservoir influenced by the karst of atmospheric fresh water. It is an important field of exploration breakthrough to find buried dissolved and superimposed reservoir in the east-shunan area of Cambrian gypsum salt rock.
- Subjects
SICHUAN Sheng (China); GAS reservoirs; FRESH water; ROCK salt; RESERVOIR rocks; GYPSUM; PETROLEUM prospecting; NATURAL gas prospecting
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 6, p5
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2020.03.007