库车坳陷迪那2气田古近系砂岩储层孔隙构造-成岩演化

发布时间：2018-02-09 09:14

本文关键词： 致密砂岩构造-成岩演化孔隙演化迪那气田塔里木盆地古近系　出处：《地质学报》2017年09期 　论文类型：期刊论文

【摘要】：以岩芯观察和薄片鉴定为基础,辅以扫描电镜、黏土矿物X衍射、流体包裹体、油层物性分析等技术手段,结合区域油气地质研究成果,系统研究塔里木盆地库车坳陷迪那2气田古近系砂岩储层孔隙构造-成岩演化与致密化过程。结果表明:研究区砂岩储层经历了同生期碳酸盐、岩盐胶结—早成岩期压实作用、胶结作用和低熟烃类充注—中成岩期有机酸溶蚀、液态烃类充注—构造挤压、构造破裂、天然气充注和晚期碳酸盐胶结等构造-成岩序列和两次致密化过程。储层原始孔隙度平均仅为31.7%,沉积作用是其致密的内因;孔隙度演化至现今约5.8%。压实作用造成了20.8%的孔隙度损失,是储层初次致密的决定性因素;胶结作用减孔约6.59%,加剧了储层致密化程度;溶蚀作用和各种成缝作用增孔约4.28%,使初次致密的储层孔隙度最高可达11%以上。从12~5Ma的康村期储层孔隙度从14.5%减少至8.0%,完成初次致密化过程,且与迪那低幅构造油藏形成大致同步,即"边致密边成藏"。5Ma以来迪那油气藏构造幅度增大,强烈构造挤压减孔2.76%,是储层再次致密的主要因素,该时期侏罗系烃源岩大规模气侵形成现今气藏,亦为"边致密边成藏"。
[Abstract]:On the basis of core observation and thin slice identification, with the help of scanning electron microscope, X-ray diffraction of clay minerals, fluid inclusions and physical properties analysis of oil and gas reservoir, combined with the results of regional oil and gas geology research, The pore tectonic-diagenetic evolution and densification process of Paleogene sandstone reservoirs in Dina 2 gas field in Kuqa depression, Tarim Basin, are systematically studied. The results show that the sandstone reservoirs in the study area experienced syngenic carbonate, salt cementation and early diagenetic compaction. Cementation and the dissolution of organic acids in the filling-middle diagenetic stage of low mature hydrocarbons, the filling of liquid hydrocarbons and the compression of structures, the structural rupture, Natural gas filling and late carbonate cementation and other tectonic-diagenetic sequences and twice densification processes. The average original porosity of the reservoir is only 31.70.Sedimentary process is the internal cause of its densification. The porosity evolves to about 5.8.The compaction results in the loss of porosity of 20.8%, which is the decisive factor for the initial compaction of the reservoir, and the cementation reduces the porosity about 6.59, which intensifies the densification of the reservoir. Dissolution and various fracturing processes increase porosity about 4.28, which makes the initial dense reservoir porosity up to more than 11%. The porosity of the Kangcun reservoir decreased from 14.5% to 8.0 at 125Ma, and the initial densification process was completed. And the formation of Dina low-amplitude structural reservoir is approximately synchronized, that is, since "edge compactness and reservoir formation" .5Ma, the tectonic amplitude of Dina oil and gas reservoir increases, and the strong structure compresses and reduces the pore 2.76, which is the main factor for the reservoir to be densified again. During this period, the Jurassic source rocks formed a large scale gas invasion gas reservoir, which is also called "edge dense reservoir formation".
【作者单位】：中国石油大学(华东)地球科学与技术学院;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室;中石油新疆分公司实验检测研究院;中石化华北分公司;中石油塔里木油田分公司勘探开发研究院;
【基金】：中国石油科技创新基金项目(编号2016D-5007-0105) 国家科技重大专项(编号2011X05001) 中石油重大科技专项(编号2010E-2103)资助成果
【分类号】：P618.13

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