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- Title
四川盆地下寒武统龙王庙组沉积模式新认识.
- Authors
杨 威; 魏国齐; 谢武仁; 刘满仓; 金 惠; 曾富英; 苏 楠; 孙 爱; 沈珏红; 马石玉
- Abstract
Natural gas in the gas reservoirs of Longwangmiao Fm, Lower Cambrian in the Sichuan Basin, is mainly concentrated in grain shoals, so the study on lithofacies palaeogeography and the prediction on grain shoal distribution are the key to improving the success ratio of natural gas exploration in this area. In this paper, outcrop, drilling, seismic and logging data were studied comprehensively. Then, based on previous research results, the sedimentary facies and sedimentary system mode of Longwangmiao Fm in the Sichuan basin and its adjacent areas were researched, and lithofacies paleogeographic maps were prepared. Besides, "three-shoal" sedimentary model of Longwangmiao Fm was established, the distribution range of 3 shoal belts was predicted and their development characteristics and main control factors were analyzed. Finally, the following directions and fields of natural gas exploration were put forward. And the following research results were obtained. First, the paleogeographic pattern of the Sichuan Basin in the Longwangmiao period is a carbonate rimmed platform, and the sedimentary facies of mixed tidal flat, restricted platform, open platform, platform margin and slope are developed. Second, the "three-shoal" sedimentary model of Longwangmiao Fm is established. One of them is the platform-margin grain shoal, and it is distributed along the eastern margin of the Sichuan Basin. The other two are intra-platform grain shoals, and they are distributed on the east and west sides of the lagoon subfacies, belonging to the restricted platform facies and the open platform facies, respectively. Third, the grain shoal of restricted platform facies is the main reservoir of Longwangmiao Fm gas reservoir in the Anyue Gas Field. It is distributed in central Sichuan, and its development is controlled by lagoons and Gaoshiti-Moxi paleouplift. Fourth, the platform-margin grain shoal is mainly distributed along the northern and eastern margins of the basin, and its development is controlled by the slope break of sedimentary paleogeomorphy. In conclusion, the grain shoal of restricted platform facies and the shoal of platform margin facies are good reservoirs and they are the important fields of natural gas exploration. Furthermore, the new understanding of "three-shoal" sedimentary model and grain shoal distribution of Longwangmiao Fm is of great theoretical significance to the study on the sedimentary systems of ancient strata.
- Publication
Natural Gas Industry, 2018, Vol 38, Issue 7, p8
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2018.07.002