海拉尔盆地苏德尔特构造带布达特群裂缝发育期次研究  

Development Period of Fractures in the Budate Group in the Sudeerte Structural Zone,Hailaer Basin

作　　者：任丽华[1] 林承焰[1] 李辉[1] 王海涛[1] 张荻楠[2] 崔宝文[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2007年第3期484-490,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家"973"项目(G1999022508);教育部第二届高校青年教师奖励基金;中国石油大庆油田有限责任公司科技攻关项目(41100366)

摘　　要：近年来，在大庆油田外围盆地油气勘探中新发现了海拉尔盆地苏德尔特构造带布达特群碎屑岩潜山油藏，其油气储集空间以构造裂缝为主，裂缝的形成、发育与演化是油气富集的重要因素。在岩心裂缝观察、构造演化历史以及热演化历史分析基础上，通过对裂缝充填方解石的稳定同住素测定和包裹体测定以及岩石声发射实验，对裂缝形成的主要期次及其特征进行了研究。研究认为，布达特群裂缝具有多期性和继承性的发育特点，主要存在3个破裂期：第一期裂缝与南屯末一大磨拐河组沉积时期的构造运动有关，缝内以石英充填为主，石英的形成温度介于72～76℃，并见有烃类包裹体，但其成熟度较低；第二期裂缝是在伊敏时期区域伸展作用下形成的，裂缝以方解石和微-细晶石英充填为主，其形成温度介于117～154℃，该期烃类成熟度明显增强；第三期裂缝是在伊敏末期强烈的抬升作用下形成的，裂缝内充填了微-细晶方解石和石英，其形成温度介于89～110℃，烃类成熟度减弱。In recent years, along with the hydrocarbon exploration of peripheral basins in the Daqing oilfield, the buried clastic hill reservoirs are found in the Budate Group in the Sudeerte structural zone of the Hailaer Basin. The reservoir space for oil-gas is mainly related to structural fractures. It has been found that the form, development and evolution of fractures have great influences on oil-gas concentration. Based on observation on bores and on analyses on the regional structural evolution history and thermal evolution history, the development periods of the fractures are searched by stable isotopic analysis, fluid inclusion homogenization temperature of in-filled components in fractures and acoustic emission technology. The results indicate the fractures in the Budate Group are of multiple-episodes and of inherited development. Three stages of fracture development have been identified. The fracture activities of the stage I are related to the Nantun--Damoguaihe movement and are filled by quartz mainly formed under temperature between 72℃ and 76℃. In this stage, hydrocarbon inclusions are found but their maturity is low. The fractures of stage Ⅱ are the products of regional extension of the Yimin phase and are filled by calcite and microcrystalline quartz, both formed at 117℃ to 154℃. Generally, the hydrocarbon maturity of this stage is relatively high. The fractures of stage HI came into being during intense uplift at the end of the Yimin period. These fractures are filled by microcrystalline calcite and quartz formed at 89℃ to 110℃. The hydrocarbon maturity of the stage lessened.

关 键 词：裂缝 发育期次 稳定同位素分析 流体包裹体 苏德尔特构造带 布达特群 

分 类 号：P618.130.25[天文地球—矿床学]