Characteristics and Exploration Direction of Upper Paleozoic Source Rock in Yanchang Block of Southern Ordos Basin

Abstract

Abstract:

A total of 636 exploration wells and appraisal wells in Yanchang block were brought under survey to predict thickness and distribution of dark mudstone of coal measures and coal rock. The purpose was to clarify the distribution characteristics and sourcing potential of dark mudstone of coal measures in Upper Paleozoic Benxi Formation to Shanxi Formation in Yanchang block of southern Ordos Basin. It is concluded that the northeastern part of Yanchang block is the main abundance area of dark mudstone of coal measures and coal rock. Meanwhile, a series of samples from more than 20 exploration wells and appraisal wells deployed in the block were acquired for indoor analysis and source rock appraisal. The analysis indicates that dark mudstone of coal measures in Benxi Formation and the second member of Shanxi Formation is high in organic matter abundance, mainly humic (type III). Organic matter is under the high-mature to over-mature stage. Finally, this paper makes a comprehensive analysis of reservoir and drilling results and comes up with the near-term exploration direction according to appraisal of source rock and on the basis of the calculated sourcing strength of Upper Paleozoic dark mudstone of coal measures in Yanchang block. Therefore it is of an important guidance to natural gas exploration and development at the next stage.

CLC Number:

Cao Yue, Yin Xiao, Zhao Qianping, Wang Guannan. Characteristics and Exploration Direction of Upper Paleozoic Source Rock in Yanchang Block of Southern Ordos Basin[J]. China Petroleum Exploration, 2015, 20(3): 13-21.

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