准噶尔盆地吉木萨尔凹陷芦草沟组致密储层裂缝发育特征及控制因素

发布时间：2018-02-23 23:14

本文关键词： 吉木萨尔凹陷芦草沟组天然裂缝成像测井发育特征控制因素　出处：《中国石油勘探》2017年04期 　论文类型：期刊论文

【摘要】：准噶尔盆地吉木萨尔凹陷二叠系芦草沟组发育一套致密储层,致密储层低孔致密的特征决定了裂缝对于改善其孔渗结构十分关键。通过野外露头、岩心、铸体薄片和扫描电镜观察,识别出芦草沟组致密储层主要发育构造缝、成岩缝和异常高压缝3种类型裂缝。构造缝包括剪切缝和扩张缝,成岩缝包括层理缝、粒内缝和粒间缝,异常高压缝主要为泄水缝。构造缝多数为高角度,与准噶尔盆地经历的几期构造运动有关。层理缝存在两种可能成因,包括构造作用和生烃作用;粒内缝和粒间缝的成因与溶蚀作用有关。泄水缝的成因是岩层在受到异常流体高压时,其中一个应力变为张应力,形成走向弯曲开度不一的裂缝脉群。通过对上甜点体13口井和下甜点体8口井的成像测井统计,发现构造缝发育较少,其密度多在0.5条/m以下;而层理缝密度高很多,多在2条/m以上;结合岩心观察统计发现,层理缝是芦草沟组致密储层最主要的裂缝类型,占总数的70%以上。影响芦草沟组致密储层裂缝发育的控制因素包括沉积微相、岩性、岩层非均质性、岩层厚度、有机碳含量和构造作用等。
[Abstract]:The Permian Lucaogou group develops a suit of tight reservoir in Jimsar sag of Junggar basin, reservoir low porosity, the characteristics of the decision of the crack to improve the porosity and permeability structure is very important. Through the outcrop, core, casting thin sections and scanning electron microscope, identify the Lucaogou Formation reservoir mainly developed structural fractures, diagenetic sewing seam and abnormal high pressure 3 types of cracks. The structural fractures include shear joints and expansion joints, diagenetic fracture including bedding fractures, intergranular cracks and intergranular fracture, abnormal pressure cracks are draining seam. Structural fractures mostly associated with high angle, the Junggar basin experienced several tectonic movements. There are two bedding joints possible causes, including tectonics and hydrocarbon generation; intergranular cracks and intergranular crack formation and dissolution. The water is in rock seam causes by abnormal fluid pressure, in which a stress is tensile stress, the formation of trend The opening of a curved fissure vein group. Through imaging logging statistics on the dessert body 13 wells and 8 wells for dessert, found that less developed structural fractures, its density is at 0.5 /m; and many more high density stratification fracture, in the above 2 /m; combined with core observation statistics bedding, seam is Lucaogou Formation tight reservoir the main fracture types, more than 70% of the total. The control factors of Lucaogou Formation of tight reservoir fractures include sedimentary facies, lithology, strata heterogeneity, rock thickness, organic carbon content and tectonic action.

【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国石油新疆油田公司勘探开发研究院;
【基金】：国家重点基础研究计划(973)项目“陆相致密油甜点成因机制及精细表征研究”(2015CB250901) 国家自然科学基金(青年基金)项目“天山地区上二叠统—中、下三叠统不整合类型及成因机制”(41502209) 中国石油大学(北京)引进人才科研启动基金“鄂尔多斯盆地上三叠统延长组储层评价及控制因素研究”(2462014YJRC031)
【分类号】：P618.13

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