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- Title
四川盆地志留系小河坝组砂岩油气 地质特征与勘探方向.
- Authors
杨威; 魏国齐; 李德江; 刘满仓; 谢武仁; 金惠; 沈珏红; 郝翠果; 王小丹
- Abstract
The sandstone of the Silurian Xiaoheba Formation in Sichuan Basin is poorly recognized and the exploration direction is not clear. Based on field outcrops,exploration wells,seismic and logging data,the basic hydrocarbon geology characteristics of strata,sediments and reservoirs of Xiaoheba Formation in Sichuan Basin and its adjacent areas are systematically studied. By analyzing the reservoir-forming assemblage and evolution and evaluating the exploration potential and direction,the following four points are obtained. Firstly,siltstone and mudstone are mainly developed in Silurian Xiaoheba Formation in Sichuan Basin and its adjacent areas and the whole formation is a delta sedimentary system of foreland basin. The siltstone development zone is the distal bar of delta front and the mudstone development zone is prodelta. Secondly,the siltstone in Xiaoheba Formation is a tight reservoir with low porosity and permeability,and the relatively high porosity reservoir is locally developed. Thirdly,an excellent source-reservoir-cap assemblage has been formed by taking thick shale of Longmaxi Formation as source rocks,siltstone of Xiaoheba Formation as reservoirs and thick shale of Lower Hanjiadian Formation as caprocks. The formation and evolution of Kaijiang paleo-uplift are beneficial to the accumulation and preservation of siltstone in Xiaoheba Formation. Finally,the siltstone in Xiaoheba Formation is a potential exploration zone for natural gas in Sichuan Basin,and the distal sand bar is the most potential one with an area of about 10 000 km2. The results are of great significance for improving geological knowledge and guiding natural gas exploration in the field.
- Subjects
SICHUAN Sheng (China); NATURAL gas prospecting; GAS fields; SAND bars; GEOLOGY; SILTSTONE; PARAGENESIS
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 1, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.11.011