塔里木盆地轮南地区三叠系孔隙演化对油气分布的影响

EFFECTS OF PORE EVOLUTION ON OIL AND GAS DISTRIBUTION IN THE TRIASSIC SYSTEM OF LUNNAN AREA IN THE TARIM BASIN

徐志强

Xu Zhiqiang

华北石油勘探开发研究院河北, 任丘, 062552

North China Research Institute of kpetroleum Exploration and Development

笔者据轮南地区三叠系大于4000m井深的钻井、岩芯分析和有机地化等资料。分析研究深部储层的成因与演比方式,从而得出:轮南地区三叠系深层碎屑岩的有效储集空间类型为次生溶蚀孔隙。根据酸性溶液的来源将三叠系深部溶蚀孔隙划分为两期演化的孔隙。Ⅰ期溶蚀孔隙是油气的主要聚集场所:Ⅱ期溶蚀孔隙是油气再分配和晚期聚集的场所。在研究孔隙演化的基础上,据砂体分布及其与生油凹陷的关系,认为轮南地区南部三亚系是勘探熔蚀孔隙型储层油气藏具有利的地区。

According to tbe data of drilling,core analysis and geochcmistry of wells deeper than 4000m in the Triassic system of Lunnan area,the author analyses and studies the geneses and evolutionary patterns of deep reservoirs and concludes that the type of the effective storing and gathering space of deep clastic rocks in the Triassic system of Lunnan area is secondary solution pore space.Based on the source of polar solution.the solution pore space in the deep Triassic system is divided into pore space of two-stage evolution,The solution pore space of Ⅰ stage is the main site for oil and gas accumulation,and the solution pore space of Ⅱ stage is the site for the redistribution and late-stage accumulation of oil and gas.On the basis of the study of pore evolution combined with sandbody distribution and its relation to oil-generating depressions,it is considered that the Triassic system of South Lunnan area is a favorable place for prospecting the oil and gas pools of solution pore space-typed reservoirs.

https://doi.org/10.11781/sysydz199502186