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Abstract
Block Yingmai 7 is structurally located in the western segment of the southern margin of the Kuqa Depression in the Tarim Basin. In the foreland basin, huge continental Mesozoic and Cenozoic strata have been deposited. In recent years, the Paleogene bottom sandstone section has been the main oil and gas exploration horizon. In order to further improve the oil and gas exploration effect of the Paleogene bottom sandstone in the study area and improve the accuracy of reservoir prediction, based on the related theory of sedimentology and petrology, this paper analyzes and studies the cores obtained by drilling in the Paleogene through laboratory core analysis experiments. The study shows that the Paleogene bottom sandstone is a braided river delta sedimentary system, and the sedimentary microfacies are mainly underwater distributary channels. The sandstone type is mainly light gray lithic feldspar fine sandstone, the sandstone debris particle sorting degree is medium-good, and the roundness is sub-edge-sub-circular. The microscopic characteristics of the reservoir are large pore throat radius, low displacement pressure, mainly intergranular pores, and good pore connectivity. It is a thin-layered mesoporous, medium-permeable, large-throat, and strongly heterogeneous reservoir. Finally, a classification evaluation table of reservoirs in block Yingmai 7 is established, and it is considered that the reservoirs of types I and II are enriched areas of oil and gas resources. The research results provide evidence for the prediction of oil and gas reservoirs.
Highlights
The Tarim Basin is the largest hydrocarbon-bearing basin in China
The Paleogene condensate gas reservoir in the Yingmaili area is one of the earliest oil and gas reservoirs discovered in the Cenozoic in the Kuqa Depression [12–14]
Through the analysis of rock color, rock mineral composition, rock structure, grain size, and comprehensive analysis of a large number of sedimentary structures in coring wells, the target layer of the Paleogene in the study area is divided into a lakebraided river delta sedimentary system, and the subfacies is divided into a shallow lake and braided river delta fronts
Summary
The Tarim Basin is the largest hydrocarbon-bearing basin in China. It is a superimposed composite basin which is located between the Tianshan Mountains, Kunlun Mountains, and Altun Mountains in Xinjiang Uygur Autonomous Region [1]. The clastic rock in the platform basin is the key area for oil and gas exploration in the Tarim Basin [5]. The Paleogene condensate gas reservoir in the Yingmaili area is one of the earliest oil and gas reservoirs discovered in the Cenozoic in the Kuqa Depression [12–14]. Due to the large differences in reservoir characteristics between different strata and different regions in the Yingmaili block, it is still necessary to conduct detailed analysis and research on key exploration areas. In this paper, taking the Yingmai 7 fault structural zone in the Yingmaili block as the research area, the core samples obtained through a large number of drillings and the laboratory core test method are used to analyze the sedimentary facies and reservoir characteristics of the sandstone at the bottom of the Paleogene in detail.
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