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- Title
Natural gas formation conditions and resource potential in mid-deep strata of the Qikou Sag, Bohai Bay Basin.
- Authors
Xiao Dun-qing; Jiang Wen-ya; Pu Xiu-gang; Wang Na; Yue Yun-fu; Sun Chao-nan; Dai Kun; Hua Shuang-jun
- Abstract
In recent years, as exploration targets have expanded to the mid-deep strata, large-scale oil resources have been discovered in the Qikou Sag of the Bohai Bay Basin, and more than 70 billion cubic meters of natural gas resources were discovered as well. The difference between the thermal evolution of deep source rocks and the physical properties of reservoirs determine the coexistence of conventional gas reservoirs and unconventional gas reservoirs in deep strata, and it is bounded by a depth of 4 700m. The main body below this depth is light sandstone gas. Using the method of generative and analogy, the Paleogene conventional natural gas resources of the Qikou Sag are more than 350 billion cubic meters, mainly distributed in the Banqiao sub-sag,and the tight sandstone gas resources are 176 billion cubic meters, mainly distributed in the mid-deep strata of Qibei sub-sag. Through the comprehensive evaluation of natural gas accumulation conditions, it further reveals that the three factors of deep high-quality source rock, high evolution and large-scale sand body are conducive to the enrichment of natural gas, which is the main occurrence state of deep hydrocarbon resources. The deep strata of Banqiao and Qibei Slopes are favorable target areas for deep gas exploration, especially in the central area of gas source, in the second member of Shagejie Formation with a certain tectonic selling and sand body development, which is the most realistic area for deep gas exploration.
- Subjects
NATURAL gas; NATURAL gas prospecting; SANDSTONE; GAS reservoirs; PLATE tectonics
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 10, p1409
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.08.012