摘要
在对辽河坳陷大民屯凹陷曹台变质岩潜山裂缝性储集层的发育期次研究中,通过岩心、薄片观察分析裂缝的特征和彼此切割关系,分析裂缝中充填的方解石包裹体性质,确定曹台变质岩潜山的裂缝系统属于被溶蚀作用改造的碎裂缝。有3期构造裂缝系统;早期裂缝系统是燕山期挤压块断构造作用的结果;中期裂缝系统在沙三段沉积期末区域性抬升挤压作用下形成,多具有剪切性质;晚期裂缝系统在东营组沉积期末的强烈抬升影响下形成,明显追踪前期裂缝并切割前期裂缝。碳、氧同位素组成分析表明,裂缝中方解石的生成与海水无关,属于中生代以后的淡水产物。研究区构造运动对形成有效储集空间的建设性作用比破坏性作用更明显。
Based on the core observation and description, optical slices observing in-filled components in fractures and the stable isotopic analysis, and combined with tectonic episodes of basement rock reservoir came through, it is determined that the formation and development of Caotai metamorphic burial hill fracture reservoir and the formation of basement rock fracture space in Damintun sag of Liaohe Oilfield are closely related to tectonic actions. With the background of Yanshan Movement that was mainly regional tectonic dynamics, three different episodes and character fracture systems just like cataclastic fractures, shear fractures and tectonic fractures were mainly formed in Caotai buried rnetamorphic basement rock hill reservoir with the compression, tension and shear stress. The fractures have the character of shear that was formed by uplifting intensively at the end of Tertiary Shahejie third period (Es3). Under the influence of uplifting intensively at the end of Dongying period (Ed), newly formed fractures were not be filled, which cut previous fractures clearly and following them, thus new fracture network was formed in basement rock body.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期18-20,共3页
Petroleum Exploration and Development
基金
同济大学理学院2001年理科基金资助项目"非常规储层参数评价与油气层的识别"(K2001-O3)
关键词
大民屯凹陷
变质岩
裂缝系统
构造期次
碳氧同位素组成
Damintun Depression
Caotai metamorphic burial hill
fissure system
tectonic period
carbon and oxygen isotopic composition
