长岭凹陷乾北地区青三段低渗透储集层特征与主控因素

发布时间：2018-01-20 04:10

本文关键词： 低孔-低渗透储集层特征主控因素青三段乾北地区长岭凹陷　出处：《矿物岩石地球化学通报》2017年02期 　论文类型：期刊论文

【摘要】：松辽盆地长岭凹陷上白垩统青山口组三段低渗透储集砂体发育,是其区内油气勘探的重点目标。基于岩石薄片、扫描电镜、X射线衍射、物性及压汞测试等资料,对长岭凹陷乾北地区青三段低渗透储集层特征与控制因素进行详细研究。结果表明:青三段储集层岩性以岩屑长石砂岩、长石砂岩为主,杂基含量较高,成分与结构成熟度均较低;储集层平均孔隙度为11.9%,平均渗透率为2.8×10~(-3)μm~2,为典型低孔-低渗储集层;储集空间类型多样,以粒间孔、粒内孔为主,孔隙结构具有4种典型类型。青三段低渗透储集层的形成是沉积作用、成岩作用等多种因素综合作用的结果。湖泛期三角洲前缘末端沉积背景下储集砂岩粒度较细,杂基含量较高,原生孔隙相对较少且连通性较差,奠定了低渗透储集层形成的物质基础;埋藏阶段压实作用和胶结作用的成岩改造,使得原生孔隙大量减少、孔隙结构趋于复杂化,储集层物性整体变差,是形成低渗储集层的关键因素;低渗透背景下,构造成因裂缝局部发育,可有效提高储集层的渗流能力,是相对优质储集层形成的有利条件。
[Abstract]:Changling sag in Songliao Basin, Cretaceous Qingshankou Formation of three low permeability reservoir sand body development, is the focus of the target area for oil and gas exploration. Based on the rock slice, scanning electron microscope, X ray diffraction, physical property and mercury injection test data of Changling depression dry area north of green three section of low permeability reservoir reservoir characteristics and controlling factors were studied. The results showed that the green three reservoir lithology is mainly lithic feldspar sandstone, feldspar sandstone, miscellaneous content, composition and structure maturity are low; average reservoir porosity is 11.9% and the average permeability is 2.8 * 10~ (-3) m~2, for storage the typical low porosity and low permeability reservoir; reservoir space types, with intergranular pore, intragranular pore, pore structure has 4 types. Green three low permeability layer is formed in deposition, a variety of factors such as the result of diagenesis. Flooding in delta front at the end of sinking Product under the background of the reservoir sandstone size is fine, impurity content is higher, the primary pores are relatively small and poor connectivity, laid the material foundation in layer formation in low permeability reservoir; diagenesis burial stage of compaction and cementation, the primary porosity decrease, Kong Xijie structure tends to be complicated, the reservoir the overall variation is the key factor to form the reservoir with low permeability; low permeability background, tectonic fracture system, which can effectively improve the seepage capacity of the reservoir, is a relatively high-quality reservoir favorable conditions layer formation.

【作者单位】：中国地质大学(北京)能源学院;中国石油大学(北京)地球科学学院油气资源与探测国家重点实验室;盎亿泰地质微生物技术(北京)有限公司;中国石油吉林油田分公司勘探开发研究院;中石化西北局塔河采油一厂;
【基金】：国家油气重大专项(2011ZX05028) 中石油天然气股份有限公司重大科技专项(2013E-0501)
【分类号】：P618.13
【正文快照】： 吉林松原138001;5.中石化西北局塔河采油一厂,新疆轮台841600低渗透储集层是一个相对的概念,是相对中、高渗储集层而言,但储集层渗透率到底低到多少算低渗透储集层,至今国际上缺乏统一而明确的标准和界限(蒋凌志等,2004)。基于中国油气田实际地质背景与油气勘探开发实践,通常

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