文档介绍：优质
摘要
塔中古隆起是塔里木古生代克拉通内长期继承性发展的巨型稳定古隆起,其油气分布主要受到古隆起的控制。古隆起是油气运移的主要指向区,是油气成藏的有利部位,控制了优质储层的分布;此外,古隆起与烃源岩的时空匹配关系是油气成藏的主控因素;油气在古隆起上的分布主要受到局部构造特征的控制。
本文主要从两个方面分析了塔中地区的成藏条件,即构造特征和石油地质特征。塔中古隆起源于早古生代拉张背景下的正断层,古隆起和斜坡控制了油气的分布与聚集,断裂和不整合面也都受到古隆起的控制,油气藏具有多期成藏与调整、晚期聚气的特征。塔中地区分布的多套烃源岩是造成油气多期充注成藏的物质基础;多种类型圈闭的发育和组合是油气藏形成的基本条件;塔中地区主要发育两类储层:一类为碳酸盐岩储层,主要为中上奥陶统储层,其储渗空间类型可分为孔、洞、缝三大类;一类为砂岩储层,主要为石炭系储层。塔中古隆起主要发育四套储盖组合序列,分别为:寒武系—下奥陶统内幕组合、下奥陶统储层与中上奥陶统盖层组合;中上奥陶统储盖组合;志留系依木干塔乌组红色泥岩盖层与塔塔埃尔塔格组砂岩储层组合;石炭系下泥岩段盖层与东河砂岩段储层组合。
综合分析得出,塔中低凸起油气藏具有多油源层、多含油气层系、成藏组合类型多样、多成藏期等特征。
Abstract
Baiyinchagan sunken is located in the west edge of Er Lian basin, it’s a secondary structural unit of Chuan Jing sunken. As other sunkens in Er Lian basin, this one is a Mesozoic basin that is growing above the base of Hercynian folding, controlled by boundary centripetal fault.
In this paper, by the use of the geology analysis method such as evolution history analysis and balanced cross section, I research the relationship between the Cenozoic structural evolution,sunken structural evolution of Bai Yin Cha Gan sunken and oil/gas resource of it, find out that Meso-cenozoic Bai Yin Cha Gan sunken go through five structural evolution phases in uprightness direction: primary chasmic stage、strong chasmic stage、fault sag stage and abortion extruding uplift stage. Generally, the structural feature of this sunken is showing protraction process additionally,its tectonic deformation is mainly protraction action deformation,its structural feature and style are great control factors of oil/gas. In the four structural form of Bai Yin Cha Gan sunken, single trough fault sunken structure has the best hydrocarbon bearing character. Cause the control of breakdown plat distribution character, in the north and south sides of the sunken, oil/gas banking presents zonal distribution.
Key words:Bai Yin Cha Gan sunken; structural evolution ;structural feature;balanced cross section;control factors of oil/gas;fault
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