Deep Hydrothermal Activityvs Petroleum Origin in Jiuxi Basin

Abstract

Abstract: Following the development of several decades, Yumen field in Jiuxi basin has not been depleted. Recently, Liugouzhuang-Kulongshan field is discovered and its origin of petroleum causes concerns. The study shows that there exist dolomite, albite, illite and lots of metal hydrothermal minerals in Xiagou formation of Lower Cretaceous in Qingxi sag of Jiuxi basin. It is a deep hydrothermal activity with abundant alkali and hydrocarbon mantle fluid. The geosciences transect research reveals that a low-velocity and highconductive layer occurs in the mid-crust of Jiuxi basin. The Pb isotopic geochemical mapping suggests that Jiuxi basin is located on highly changing zone in Pb isotopic geochemistry. These features indicate that Jiuxi basin is an area with strong crust-mantle interaction, and its petroleum could be originated in inorganic origin. Such an idea means that Jiuxi basin will be better prospective in petroleum exploration in the future.

Key words: Jiuxi basin, hydrothermalism, petroleum origin, mantle, mid-crust

CLC Number:

TE112.11

SHI Lan-ting, WANG Bin-ting, ZHENG Rong-cai, ZHANG Jing-lian. Deep Hydrothermal Activityvs Petroleum Origin in Jiuxi Basin[J]. Xinjiang Petroleum Geology, 2008, 29(2): 152-154.

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