| Author's Name: ZHOU Jin’gao, HAO Yi, DENG Hongying, GU Mingfeng, PAN Liyin, YAO qianying, YANG Yuran, LOU Xue |
| Institution: PetroChina Hangzhou Research Institute of Geology |
| Abstract: |
| Recently, continuous breakthrough have been made in the exploration of Qixia Formation and Maokou Formation in the western-central Sichuan Basin, which has attracted extensive attention to the dolomite reservoir. Based on the geological background of reservoir formation, taking outcrops and cores as the access point and combining with the experimental analysis, four significant conclusions on the genesis and distribution of reservoir are drawn: (1)Dolomite reservoirs in both Qixia Formation and Maokou Formation developed in the highstand systems tract. The platform margin facies and the syneclise margin facies are the main sedimentary environment of reservoir development.(2)Crystalline dolomite, including residual granular dolomite and medium to fine crystalline dolomite, is the main lithology of reservoir, and dissolution holes, residual intergranular pores, biological coelomic pores and fractures are the main reservoir space. Both the Qixia Formation with an average porosity of 3.87% and the Maokou Formation with an average porosity of 4.57% show good reservoir property. (3)Grain beach subfacies and penecontemporaneous dissolution are the two major controlling factors of reservoir formation. Grain beach is the material basis of reservoir development and the carrier of primary pore. Penecontemporaneous dissolution is the key to improve the reservoir space by enlarging primary pores into holes. (4)The marginal-platform shoals along Jian’ge-Ya’an and the marginal-syneclise shoals along Yanting-Guang’an are the favorable zones of dolomite reservoir development and the main target areas of gas exploration. |
| Keywords: sedimentary facies； dolomite reservoir； favorable zone; Qixia Formation； Maokou Formation； Sichuan Basin |
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投稿时间：
2018-01-30 |
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