楚雄盆地北部T_3-J地层天然裂缝形成期次确定  

Determination of fracture's development periods of T_3-J formation in the north of Chuxiong basin of Yunnan,China

作　　者：周文[1] 张银德[1] 王洪辉[1] 祁华忠[1] 牛会玲[1] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059

出　　处：《成都理工大学学报（自然科学版）》2008年第2期121-126,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金："油气藏地质及开发工程"国家重点实验室资助项目

摘　　要：楚雄盆地T3—J地层经历了多期复杂的构造运动，裂缝形成期次多、特征复杂。通过野外地面裂缝调查和样品的实验室分析测定，采用4种方法研究和确定了T3—J地层裂缝的形成期次。野外地面裂缝调查见4组裂缝发育；裂缝样品的声发射实验表明地层至少存在4个构造应力破裂期，应力作用历史复杂。燕山期构造应力场方向以NE向为主，喜马拉雅构造应力场变为SE向。晚期构造应力（喜马拉雅期）强度大，为主要的破裂期。ESR测试分析表明该层存在5个破裂期；碳氧同位素测定表明研究区地层天然裂缝存在3期以上成因序列；包裹体测定结果按均一温度大小分布可划分出5个破裂期。综合研究区天然裂缝特征、地质构造演化历史，确定出该区地层中天然裂缝为构造裂缝，且组系清楚。裂缝有5～6个破裂期，与构造活动期对应较好，主要破裂期为燕山期、喜马拉雅期。The T3- J formation of Chuxiong basin have gone through many complex tectonic movements, and the fracture＇s development periods are complex. According to ground fracture＇s investigation and samples＇ test, the authors use four methods to determine the fracture＇s development periods. Four pairs of natural fractures are watched by field ground facture investigation. Acoustic emission experiment proves that there are at least four structure stress breakup phases in the researched area and the complex course of tectonic stress is NE, but the stress field changes to SE in the the Himalaya period. And later the Himalaya period movement becomes the main breakup period with strengthened stress. Five breakup stages are tested by ESR. There, more than three stages of genetic series of natural fractures are tested by C-O isotope analysis. Five breakup stages can be divided by inclusion test according to distribution of homogenization temperatures. Combined with the features of the natural fractures and the evolution history of tectonics, it is certain that the fractures in the region are mainly structural fractures with distinct battery and series. The fracture has five or six breakup phases, matching the tectonic movements well. And the main breakup phases are Yanshan and Himalaya periods.

关 键 词：同位素 包裹体 电子自旋共振测定年龄 声发射实验 构造裂缝 

分 类 号：TE371[石油与天然气工程—油气田开发工程]