辽河坳陷茨榆坨潜山太古界基岩储层岩性和储集空间特征  

Reservoir lithology and space characteristics of the Archaeozoic basement rock in Ciyutuo buried hill,Liaohe Depression

作　　者：朱毅秀[1,2] 王欢 单俊峰[3] 杨程宇[1,2] Zhu Yixiu;Wang Huan;Shan Junfeng;Yang Chengyu(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102200,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102200,China;Research Institute of Exploration and Development of Liaohe Oilfield Company Ltd.,PetroChina,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102200 [2]中国石油大学(北京)地球科学学院,北京102200 [3]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《石油与天然气地质》2018年第6期1225-1236,共12页Oil & Gas Geology

基　　金：国家科技重大专项(2011ZX05006-005;2016ZX05063-002)

摘　　要：辽河坳陷茨榆坨潜山太古界变质岩基岩内幕研究程度相对较低。综合利用录井、测井、地震、岩心与实验分析等多种资料,研究岩性特征与空间展布规律、储集空间类型与特征、岩性对物性影响,有助于本区域进一步有效地勘探开发及丰富和完善新型的基岩内幕油气成藏理论。研究区太古界基岩岩性复杂,共分为11类18种。变质岩储层有混合花岗岩、黑云母花岗片麻岩、混合岩化片麻岩、碎裂岩与碎斑岩。基岩在垂向上由下至上分为多个岩性段,平面上具分区性,低部位为混合花岗岩夹碎裂岩、中低部位为混合片麻岩与混合花岗岩夹碎裂岩、较高部位为片麻岩。变质岩潜山的储集空间为裂隙和在裂隙基础上扩大的溶孔和溶缝,以构造裂缝为主,不同岩性裂缝发育程度不同,非均质性强,具有分带特征,断裂发育储集带为主要目标带。岩石类型和矿物种类对茨榆坨潜山基岩储层起控制作用,动力改造的破碎状混合花岗岩与碎裂化花岗片麻岩可作为优质储层。统计显示,研究区深色矿物含量小于10%的碎裂化混合花岗岩和深色矿物含量小于12%的碎裂化花岗片麻岩易于形成优质储集岩。Understanding of the interior of the Archaeozoic metamorphic basement rocks in Ciyutuo buried hill,Liaohe Depression,is relative poor.The comprehensive research that involves logging,seismic,core and experimental data could be of great help to detect the lithology and distribution of the basement rock,types and characters of reservoir space as well as the impact of lithology on the reservoir physical properties,to further explore and develop petroleum effectively,and to perfect the new theory of petroleum accumulation in the interior of basement rock reservoirs.The Archaeozoic basement rock litho-logy in the study area is quite complicated,and can be classified into 11 categories and 18 kinds.The lithologies of the me-tamorphic reservoir include migmatitic granite,biotite granite-gneiss,migmatitic-gneiss,cataclasite and murbruk rock.The basement rocks feature vertical segmentation and lateral zonation of lithology:migmatitic granite with cataclasite interlayer occurring the lower part,migmatitic-gneiss and migmatitic granite with cataclasite interlayer in the middle-lower part,and gneiss in the upper part.The reservoir space of the metamorphic buried hill is cracks and dissolved pores and fractures starting from the cracks,with the structural fractures being dominant.The fractures are developed to various degrees in different lithologies,have strong heterogeneity,and are characterized by zonation.Reservoir zones with highly developed fractures are the main target of the exploration.The basement rock reservoir in Ciyutuo buried hill is controlled by petrology and mineralogy.Fragmented migmatitic granite and fragmented granite-gneiss could be quality reservoirs.Statistics show that the cataclasite-migmatitic granite with a ferromagnesian content of less than 10%and the cataclasite granite-gneiss with a ferromagnesian content of less than 12%are favorable for the formation of quality reservoir rocks.

关 键 词：基岩 变质岩 岩性 储层 茨榆坨潜山 辽河坳陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]