Application of paleogeomorphology restoration technology in lithologic reservoir exploration of the Middle-Lower Carboniferous in the eastern margin of Pre-Caspian Basin

doi:10.3969/j.issn.1672-7703.2022.02.012

Abstract

Abstract: Oil and gas have continuously been discovered in the Middle-Lower Carboniferous carbonate rocks (KT-Ⅱ layer) in the eastern margin of Pre-Caspian Basin. With the progress of exploration, the prediction of thin carbonate reservoir is facing challenges. By starting from the paleogeomorphology before the deposition of KT-Ⅱ layer, the depositional settings during the deposition of carbonate rocks is restored, and the law of reservoir distribution is identified. The KT-Ⅱ layer is subdivided into three third-order sequences from bottom to top, i.e., SQ1, SQ2, and SQ3. Based on the fine seismic interpretation of high-frequency sequence, the paleogeomorphology before the deposition of each sequence was restored by using the methods of seismic horizon flattening, residual formation thickness and moulage. The beach body of SQ1 was mainly deposited around the slope break zone, with a large thickness in local area; The beach body of SQ2 was mainly distributed in slope zone between the low potential area and the high potential area, with continuous distribution and more developed reservoir towards the high potential area; While the beach body of SQ3 was mainly deposited in slope zone between two strike-slip faults.

CLC Number:

TE111

Wang Yankun, Wang Zhen, Liang Shuang, Sheng ShanBo, Zang Zhenxia. Application of paleogeomorphology restoration technology in lithologic reservoir exploration of the Middle-Lower Carboniferous in the eastern margin of Pre-Caspian Basin[J]. China Petroleum Exploration, 2022, 27(2): 131-141.

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