致密碳酸盐岩储集层特征与天然气勘探潜力——以鄂尔多斯盆地伊陕斜坡东部奥陶系马家沟组为例

发布时间：2018-03-13 12:15

本文选题：鄂尔多斯盆地　切入点：伊陕斜坡东部　出处：《石油勘探与开发》2017年03期 　论文类型：期刊论文

【摘要】：基于钻井、试气、分析化验等资料的综合分析,对鄂尔多斯盆地伊陕斜坡东部奥陶系马家沟组马五_(1+2)亚段致密碳酸盐岩储集层特征及其成因进行研究,并对天然气勘探潜力进行分析。研究提出致密碳酸盐岩储集层为孔隙度小于2%、渗透率小于0.1×10~(-3)mm~2的储集体。伊陕斜坡东部马五_(1+2)亚段致密碳酸盐岩储集层以含膏泥粉晶白云岩、泥粉晶白云岩及岩溶角砾白云岩为主,孔隙类型以裂缝-溶孔、裂缝-晶间孔为主,非均质性强,储集层呈薄层大面积展布。奥陶系顶部不整合面构造调整导致的储集层"造孔"与"填孔"作用,以及埋藏期溶蚀增孔与沉积充填减孔共同作用是储集层大面积致密化的主要原因。薄层白云岩致密储集层与上覆广覆式上古生界煤系烃源岩紧邻形成大面积致密碳酸盐岩气成藏组合,含气普遍,气藏埋深浅(1 900~2 500 m),与上古生界致密砂岩气组成立体含气模式,因此鄂尔多斯盆地伊陕斜坡东部勘探开发潜力大。
[Abstract]:Based on the comprehensive analysis of drilling, gas test and laboratory data, the characteristics and origin of dense carbonate reservoirs in the Mawujiagou formation of the Ordovician Majiagou formation in the eastern part of the Ordos Basin are studied. The gas exploration potential is analyzed. It is proposed that the tight carbonate reservoir is a reservoir with porosity less than 2 and permeability less than 0.1 脳 10 ~ (-3) mm ~ (-2). The dense carbonate rock reservoir in the eastern part of Yi-shan slope is composed of mud-bearing powdered dolomite. Mudstone dolomite and karst breccia dolomite are dominant. The pore types are fracture-dissolved pore, fission-intergranular pore, strong heterogeneity. The reservoir is distributed in a large area of thin layer. The effect of "pore making" and "filling hole" caused by the structural adjustment of the unconformable surface at the top of Ordovician, The main reason for the large area densification of the reservoir is the interaction of the corrosion increasing pore and the depositional filling and decreasing pore during the burial period. The compact reservoir of thin layer dolomite and the overlying and overlying source rock of coal measure of Upper Paleozoic formed a large area compact. Carbonate gas accumulation assemblage, The gas bearing is universal, the gas reservoir is buried in shallow depth of 1 900 ~ 2 500 m ~ (-1), and it forms a three-dimensional gas bearing model with the upper Paleozoic tight sandstone gas. Therefore, there is a great potential for exploration and development in the eastern part of the Yishan slope in the Ordos Basin.
【作者单位】：中国石油长庆油田公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;成都理工大学;长江大学;中国石油勘探开发研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05044)
【分类号】：P618.13

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