Distribution features of ancient karst landform in the fourth Member of the Dengying Formation in the Gaoshiti-Moxi region and its guiding significance for gas reservoir development
Yan Haijun1, Peng Xian2, Xia Qinyu1, Xu Wei2, Luo Wenjun2, Li Xinyu1, Zhang Lin1, Zhu Qiuying1, Zhu Xun2, Liu Xixiang2
1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Sichuan Chengdu 610051, Chnia
Based on the 3D seismic and well completion data in the Gaoshiti-Moxi region of Sichuan Basin, this study restores the ancient karst landform of the fourth member of the Sinian Dengying Formation in Gaoshiti-Moxi region using the dual interface method in combination with advantages of the high-resolution method, bedding flattening method, residual thickness method, and impression method. The ancient karst landform of the fourth Member of Dengying Formation is composed of three first-order ancient landform units of karst lowland, karst slope, and karst platform and seven second-order ancient landform units of steep slope, gentle slope, platform slope, platform surface, depression, gully, and monadnock. The ancient karst landform in the fourth member of Dengying Formation has the characteristics of "two ditches and three regions, gentle in the north and steep in the south". Three ancient landform units of platform slope, platform surface and monadnock are developed in Gaoshiti. Gentle slope and platform surface are developed in the main body of Moxi region butplatform surface, depression and monadnock are developed inside the platform. In the micro-geomorphic units of platform slope, platform surface and slope, high-quality reservoirs are well developed, andit has achieved good effect of drilled wells. There are obvious differences between Gaoshiti and Moxi areas. The results show that the ancient karst landform has obvious control effect onhigh-yield well. The next step is to finely characterize the distribution of gullies, argue the control of faults and paleo-grooves on the distribution of ancient landform, establish theclassification standard of ancient landforms in different regions, and evaluate the distribution of dominant micro-topographic units in the study area to support the selection of favorable production regions and optimization of the target development well locations, so as to ensure the rapid production and long-term stable production of Sinian gas reservoirs in the Gaoshiti-Moxi region.
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Yan Haijun, Peng Xian, Xia Qinyu, Xu Wei, Luo Wenjun, Li Xinyu, Zhang Lin, Zhu Qiuying, Zhu Xun, Liu Xixiang. Distribution features of ancient karst landform in the fourth Member of the Dengying Formation in the Gaoshiti-Moxi region and its guiding significance for gas reservoir development[J]. Acta Petrolei Sinica, 2020, 41(6): 658-670,752.
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