鄂尔多斯盆地南部延长探区上古生界烃源岩特征与勘探方向

摘要/Abstract

摘要： 为了搞清煤系暗色泥岩在鄂尔多斯盆地南部延长探区上古生界本溪组—山西组分布特征及生烃潜力，对延长探区636口探井、评价井煤系暗色泥岩、煤岩厚度进行了大量统计及分布预测，提出了延长探区东北部为煤系暗色泥岩和煤岩主要富集区。同时对探区均匀分布的20余口探井、评价井进行系统取样、室内化验分析及烃源岩评价工作，分析认为本溪组、山西组山2段煤系暗色泥岩有机质丰度较高，有机质类型以腐殖型（Ⅲ型）为主，有机质处于高—过成熟阶段。最后依据烃源岩的评价成果，在计算延长探区上古生界煤系暗色泥岩生烃强度的基础上，综合储层及钻探成果的综合分析，提出了近期勘探方向，对下步天然气勘探开发部署具有重要的指导意义。

关键词: 鄂尔多斯盆地南部, 上古生界, 煤系暗色泥岩, 烃源岩评价, 勘探方向

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.

中图分类号:

曹跃, 银晓, 赵谦平, 王冠男. 鄂尔多斯盆地南部延长探区上古生界烃源岩特征与勘探方向[J]. 中国石油勘探, 2015, 20(3): 13-21.

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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