库车坳陷迪那气田古近系裂缝发育的多样性与差异性

发布时间：2018-05-03 19:25

本文选题：构造裂缝 + 溶蚀裂缝　；参考：《石油与天然气地质》2017年05期

【摘要】：以岩心观察和薄片鉴定为基础,辅以扫描电镜、粘土矿物X-衍射、流体包裹体、油层物性分析等手段,结合区域地质研究成果,系统研究塔里木盆地库车坳陷迪那气田古近系低渗-特低渗砂岩储层裂缝的多样性和差异性。结果表明:宏、微观裂缝主要为构造裂缝,其余依次为溶蚀裂缝、成岩裂缝和超压裂缝。构造裂缝分为剪切裂缝、扩张裂缝和震裂缝3种主要类型(以剪切裂缝为主)和3个发育期次;其中对储集烃类最为有效的裂缝形成于晚喜马拉雅期(上新世末期,即2.6~1.81 Ma)的构造挤压作用;溶蚀裂缝、成岩裂缝与超压裂缝与油气注入引起的溶蚀作用、粘土矿物脱水收缩、强烈构造挤压、快速深埋及流体增压造成的地层超压有关,主要形成时间为库车末期至西域期(2 Ma至现今)。裂缝发育的差异性主要受岩石类型、沉积相带、单层厚度和与主控断层距离的控制。位于气田中部的水下分流河道以粉细砂岩为主,裂缝最发育,单井产能高。裂缝线密度与单层厚度呈"座椅"式负相关,随着与主控断层距离增大而减小;泥岩裂缝线密度小于0.4条/m,且与单层厚度无关。
[Abstract]:On the basis of core observation and thin slice identification, with the aid of scanning electron microscope, X- diffraction of clay minerals, fluid inclusions and physical properties analysis of oil layers, combined with the results of regional geological research, The diversity and difference of fractures in Paleogene low-permeability and ultra-low permeability sandstone reservoirs of Dina gas field in Kuqa depression of Tarim Basin are systematically studied. The results show that the macro and micro fractures are mainly structural fractures, while the others are dissolution fractures, diagenetic fractures and overpressure fractures. Structural fractures are divided into three main types: shear fractures, extensional fractures and seismic fractures (mainly shear fractures) and three developmental stages, in which the fractures most effective for hydrocarbon reservoirs were formed in the late Himalayan period (late Pliocene). That is, the tectonic squeezing of 2.6U 1.81 Ma, the dissolution of dissolved fractures, diagenetic and overpressure fractures and oil and gas injection, the dehydration and shrinkage of clay minerals, the strong tectonic compression, the rapid and deep burying, and the formation overpressure caused by fluid pressure. The main time of formation is 2 Ma from late Kuqa to Xiyu period to present day. The difference of fracture development is mainly controlled by rock type, sedimentary facies, monolayer thickness and distance from the main fault. The underwater distributary channel located in the middle of the gas field is mainly silty sand with the most developed fractures and high single well productivity. The linear density of the fracture is negatively correlated with the thickness of the single layer and decreases with the increase of the distance between the fracture and the main fault, and the linear density of the mudstone fracture is less than 0.4 / m, which is independent of the thickness of the single layer.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石油新疆油田分公司实验检测研究院;中国石化胜利油田森诺胜利工程有限公司;中国石化华北分公司勘探开发研究院;中国石油塔里木油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05003-04) 中国石油科技创新基金项目(2016D-5007-0105) 中国石油重大科技专项(2010E-2103)
【分类号】：P618.13

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