Geological characteristics and hydrocarbon distribution in major sedimentary basins in Nansha sea areas

doi:10.3969/j.issn.1672-7703.2018.01.007

Abstract

Abstract: Based on previous studies, the latest processing and interpretation results of seismic, gravity, magnetic and electdrical data and the latest collection of foreign geochemical data, the tectonic evolution, sedimentation, geological conditions and distribution characteristics of reservoirs in major sedimentary basins in Nansha sea areas were summarized. The study indicates that the Cenozoic Nansha sea areas generally experienced three tectonic evolution stages and two basining periods during which four fault systems and three types of basin groups were devloped with obvious basin-controlling fault zones; three ancient river systems in South China Sea controlled the distribution of the Cenozoic sedimentary systems in Nansha sea areas where marine, lacustrine, delta, swamp, carbonate platform and organic reef facies were developed, and as the ancient South China Sea disappeared and the modern South China Sea expanded, sedimentary evolution took place from continental to transitional to marine facies in different types of basins; three sets of hydrocarbon source rocks were identifed, Which include lacustrine and transitional mudstones, carbonaceous shale and coal seams; three sets of reservoirs were identified wich the main reservoir of Miocene sandstone and reef limestone; three sets of source-reservoir-caprock systems were found, mainly shore-shallow marine carbonate rock, transitional clastic rock and marine clastic rock. Large and medium oil & gas fields in Nansha sea areas are characterized by rich oil and gas in outer sandstone reservoirs and rich gas in inner carbonate reservoirs, and the oil and gas distribution shows vertical zoning and horizontal segmenting. Nansha sea areas possess huge potentials of oil and gas resources-the accumulated initially in place resources of oil and gas are 201×10⁸t and 32.4×10¹²m³, respectively.

Key words: tectonic evolution, sedimentary characteristics, reservoir geological conditions, law of distribution

CLC Number:

Zhang Houhe, Liu Peng, Liao Zongbao, He Shuanzhu, Xu Qingmei, Zhu Xiaomin, Qi Jiafu, Yang Minghui. Geological characteristics and hydrocarbon distribution in major sedimentary basins in Nansha sea areas[J]. China Petroleum Exploration, 2018, 23(1): 62-70.

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