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- Title
克拉通内裂陷边缘台缘丘滩体规模储层发育 主控因素与成因模式: 以四川盆地德阳—安岳克拉通内裂陷东侧灯影组四段为例.
- Authors
杨 威; 魏国齐; 谢武仁; 苏 楠; 曾富英; 郝翠果; 白壮壮; 黎 荣; 武雪琼; 苏亦晴
- Abstract
A large platform margin mound-shoal complexes of the fourth member of Dengying Formation(Deng 4 Member)is developed in the margin of Deyang-Anyue intracratonic rift in Sichuan Basin,and the platform margin mound-shoal complexes reservoir in Gaoshiti-Moxi area is the main production layer of Anyue gas field. A clear understanding of the reservoir genetic mechanism of the mound-shoal complexes is the key to predict the distribution of high-quality reservoirs and guide the deployment of exploration. Based on the data of drilling, seismic,outcrop and analytical data,this paper analyzes the reservoir characteristics and genetic mechanism of the mound-shoal complexes at the margin of the Deng 4 Member,and obtains three new understandings:(1) There are two platform margin mound-shoal complexes belts on the margin of Deyang-Anyue intracratonic rift in Sichuan Basin. The mound-shoal complexes are mainly composed of algal mound and granular bank in multi⁃ ple stages. The reservoir space is mainly dissolved pores,caves and fractures,with low porosity and low perme⁃ ability in general.(2)The reservoir can be divided into three types,and the fracture-dissolution pore type is the best;the platform margin mound-shoal complexes reservoir is better than the intra-platform mound-shoal com⁃ plexes,which is the basis for the formation of high quality reservoir;Penecontemporaneous interstratified karst and two-stage weathering crust karst play an important role in the scale reservoir formation of mound-shoal com⁃ plexes,and the upper part of the reservoir in the same stage is good,and the reservoir at the top of Deng 4 Member is good.(3)Before the Himalayan movement,the reservoir forming and its environments of the two platform margin mound-shoal complexes were basically the same,and the characteristics of the formation of the reservoir were similar. The Himalayan movement led to a great difference in the current buried depth of the res⁃ ervoir,resulting in a host of fractures and retaining a host of solution pores and caves. The whole platform mar⁃ gin mound-shoal complexes develop large-scale reservoirs and have good exploration prospect. The results en⁃ rich the theory of ancient and deep carbonate reservoir forming and its genetic mechanism and provide geological basis for exploration and deployment.
- Subjects
SICHUAN Sheng (China); PROSPECTING; CARBONATE reservoirs; KARST; RIFTS (Geology); CAVES; WEATHERING; CRATONS; SHALE gas reservoirs
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 10, p1541
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.07.013