致密砂岩储层物性特征及其控制因素——以松辽盆地大安地区白垩系泉头组四段为例

发布时间：2018-02-20 01:12

本文关键词： 致密砂岩物性特征 “甜点”储层泉四段松辽盆地　出处：《中国矿业大学学报》2017年04期 　论文类型：期刊论文

【摘要】：为了阐明致密砂岩储层的物性特征及其控制因素,以松辽盆地大安地区白垩系泉头组四段致密砂岩为例,综合采用覆压孔渗测试、X衍射分析、恒速压汞测试及岩样显微观察等方法,系统研究了常规条件下和覆压条件下储层物性特征及孔、渗关系,分析了致密砂岩储层物性特征的控制因素,认为普遍致密背景下存在部分物性较好的"甜点"储层是致密砂岩储层的典型特征,沉积微相类型和孔喉结构特征是储层物性差异的主控因素.研究结果表明:孔隙度和渗透率在覆压条件与常规条件下的测量结果都近似呈线性变化关系,覆压条件下孔隙度损失比例约为5%,渗透率损失比例约为26%.常规条件下,致密砂岩储层的孔隙度分布范围为1.1%~13.5%,渗透率分布范围为0.01~16.00mD,孔渗关系表现为"分段"特征.考虑到不同地区砂岩的致密化成因、"甜点"储层发育程度及地质条件的复杂性等因素,建议将致密砂岩储层的物性上限定义为:90%样品的常规渗透率值小于1.00mD,并确定泉四段致密砂岩"甜点"储层的物性下限为:常规孔隙度值为7.5%,常规渗透率值为0.2mD.泉四段储层物性特征及其差异性是沉积作用和成岩作用的综合响应,强压实和多成分胶结是储层普遍致密的主控因素,沉积微相类型和不均衡溶解是储层物性差异的主控因素,孔喉结构特征是渗透性好坏的关键影响因素.
[Abstract]:In order to clarify the physical characteristics of tight sandstone reservoir and its control factors in the Cretaceous Songliao Basin spring area head four tight sandstone were integrated by overburden pressure permeability test, X diffraction analysis, mercury injection test and rock microscopic observation and other methods, the reservoir characteristics and under the hole. Under normal conditions and overburden pressure permeability were studied, analyzed the factors controlling the reservoir characteristic of tight sandstone reservoir, common dense background has better properties of "dessert" reservoir is the typical tight sandstone reservoir characteristics, sedimentary facies types and pore structure characteristics is the main control the difference of reservoir properties factors. The results show that the porosity and permeability measurement in the overburden pressure conditions and under normal conditions the results are approximate linear relation ratio under overburden pressure porosity loss of about 5%, permeability loss ratio is about 26%. routine Under the condition that the porosity distribution of tight sandstone reservoir is 1.1%~13.5%, the permeability distribution in the range of 0.01~16.00mD, the relationship between porosity and permeability is "sub" characteristics. Considering the different causes of sandstone densification, "dessert" reservoir development degree and the complexity of the geological conditions and other factors, suggestions will be the upper limit of the definition of tight sandstone reservoir the 90% layer: the conventional permeability value of samples is less than 1.00mD, and determine the physical limit spring four tight sandstone reservoir "dessert" is: the conventional porosity value is 7.5%, the conventional permeability characteristics and the difference of 0.2mD. for spring four reservoir is the comprehensive response of sedimentation and diagenesis. Strong compaction and cementation is the main component of multi reservoir generally dense, sedimentary microfacies and uneven dissolution is the main controlling factors of reservoir property differences, pore structure characteristics is the key factor for the permeability of good or bad.

【作者单位】：东北石油大学地球科学学院;中国石油大学油气资源与探测国家重点实验室;
【基金】：国家高技术研究发展计划(863)项目(2013AA064903) 黑龙江省博士后资助经费项目(LBH-Z14047) 油气资源与探测国家重点实验室开放基金(PRP/open-1405)
【分类号】：P618.13

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