Oil Sources Analysis of the Jurassic Crude Oil in the Southern Tianhuan Depression, Ordos Basin

Abstract

Abstract:

The southern Tianhuan Depression is located in the southwest of the Ordos Basin, stretching across both of the west thrust belt and the Tianhuan Depression with complex geological conditions. In recent years, the exploration of the Jurassic low-amplitude structural-lithologic reservoirs has gained a great breakthrough with several high productive oilflow wells found in this region. However, there are some different points of view about the resources of the Jurassic oil and gas, which has constrained the further exploration. In this paper, comparative studies have been done about the Jurassic crude oil and three series of source rocks which are separately from the Chang 4+5, Chang 6 and Chang 7 Sections of the Triassic Yanchang Formation from the aspects of biomarker and carbon isotope, etc. with the methods of GC-MS and carbon isotope analysis. Besides, the oil sources of the Jurassic crude oil have been discussed according to the Jurassic oil and gas accumulation characteristics. The study results show that the Jurassic crude oil and source rocks in the sixth and seventh members of Yanchang Formation in the southern Tianhuan Depression have similar characteristics in the aspects of resource properties, sedimentary environments and maturity; meanwhile, the regional unconformities and cracks formed the migration pathway of the Jurassic reservoir beds and the crude oil of the sixth and seventh members of the Yanchang Formation; the Jurassic crude oil is mainly derived from the source rocks of the sixth and seventh members of the Yanchang Formation.

Key words: oil sources analysis, Jurassic crude oil, Tianhuan Depression, Ordos Basin

CLC Number:

TE122.1

ZH AO Yan-De, LIU Xian-Yang, ZHANG Xue-Feng, ZHANG Zhong-Yi, LI Cheng-Shan. Oil Sources Analysis of the Jurassic Crude Oil in the Southern Tianhuan Depression, Ordos Basin[J]. Geoscience, 2011, 25(1): 85-93.

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