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The Lithofacies Paleogeographic of the Middle Permian Deep Maokou Formation and Its Significance for Hydrocarbon Exploration, Northwestern Sichuan Basin
Li Wen, Yang Shuai, Chen Anqing, Zhang Xihua, Chen Cong, Xu Shenglin, Sun Shi, Luo Jian, Chen Hongde
PDF(12181 KB)
PDF(12181 KB)
The Lithofacies Paleogeographic of the Middle Permian Deep Maokou Formation and Its Significance for Hydrocarbon Exploration, Northwestern Sichuan Basin
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The northwest of Sichuan Basin are the key region of deep oil and gas exploration. Changxing Formation Formation platform marginal reef-flat gas fields have been discovered around"Kaijiang-Liangping" deep-water trough. Recently, with the new discovery of oil and gas in the Maokou Formation under the oil and gas accumulation zone, the forming time and scope of the deep-water trough and its constraint on the favorable exploration zone of the Maokou Formation have become a new research hotspot. Based on several field outcrop sections and drilling data in northwest Sichuan Basin, we reconstructed lithofacies paleogeographic of Maokou Formation in detail, and revealed the differentiation of deep-water facies and platform facies in Middle-Late of Maokou Formation. The sedimentation in facies belt results in the zonal synergistic difference in strata thickness; We reconstructed the lithofacies paleogeography and described the structure-sedimentary differentiation model of the Middle-Late Maokou Formation. This study confirms that the forming time of Kaijiang-Liangping trough should be pushed forward to the late of Middle Permian. Generally speaking, the deep-water trough of Makou Formation spreads along the Guangyuan-Bazhong-Pingchang area, and the platform margins on both sides are the potential development area of a new large-scale oil and gas accumulation zone. The platform margin zone formed by the tectonic-sedimentary differentiation is the initial geomorphological inherited margin along deep water trough, with the characteristics of wide margin and thin shoal body. The structure of shoal facies is discontinuous accretion, which is in sharp contrast to the narrow margin and thick shoal pattern formed by continuous accretion or progradation of generated on the edge in Changxing Formation.
paleogeography / platform-trough differentiation / platform margin / Middle Permian / Maokou Formation / petroleum geology
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