鄂尔多斯盆地周长地区长9油层组浊积岩及致密油勘探意义

摘要/Abstract

摘要： 对周长地区延长组长9油层组浊积岩进行研究，并通过油源条件、储层特征、储盖组合、排烃压力对其致密油勘探意义进行了探讨。研究发现，周长地区浊积岩岩性主要为长石砂岩，发育不完整鲍马序列及准同生变形构造。储层孔隙度平均为5.18%，渗透率平均为0.17mD，属致密储层。分析化验表明李家畔页岩为优质烃源岩，可为长9油层组致密油提供充足的油源，同时可作为有效区域盖层，浊积砂体与李家畔页岩构成良好储盖组合，具备一定致密油勘探潜力。长9烃源岩生烃增压产生的源储过剩压力差是原油向下运移的动力，应根据排烃压力与良好储盖组合相结合确定致密油勘探有利目标。

关键词: 鄂尔多斯盆地, 周长地区, 长9油层组, 浊流沉积, 致密储层, 过剩压力

Abstract: Turbidity of Chang 9 layer of Yanchang Formation in Zhouchang area is brought under study for the purpose to discuss the significance of regional tight oil exploration in the aspects of oil source conditions, reservoir characteristics, reservoir assemblage and expulsion pressure of hydrocarbon. The study indicates that turbidity in Zhouchang area is mainly feldspathic sandstone with development of erosion surfaces and synsedimentary deformation structures in Bouma sequence. The porosity of reservoir is 5.18 percent on average while the permeability is 0.17mD on average. It is a tight reservoir. Based on the analysis and testing, shale in Lijiapan is high-quality source rock that serves as the sufficient source for tight oil of Chang 9 layer. Meanwhile it is also an effective regional cap rock. The good reservoir-cap assemblage of turbidity sand body and Lijiapan shale structure has a certain potential for tight oil exploration. Excessive pressure from hydrocarbon pressurization in source rock of Chang 9 layer is the force to make crude oil migrate downward. It is necessary to determine the favorable tight oil exploration targets on the basis of combining hydrocarbon expulsion pressure with the good reservoir-cap assemblage.

葛云锦, 贺永红, 焦健, 宋健, 贾乐平. 鄂尔多斯盆地周长地区长9油层组浊积岩及致密油勘探意义[J]. 中国石油勘探, 2015, 20(4): 30-36.

Ding Chao, Wang Jiawei. Tight Oil Exploration of Chang 9 Turbidity in Zhouchang Area of Ordos Basin[J]. China Petroleum Exploration, 2015, 20(4): 30-36.

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