埕岛油田埕北古7潜山变质岩储层特征及影响因素

Characteristics of Metamorphic Rock Reservoirs and Its Influencing Factors on Chengbeigu 7 Buried Hill in Chengdao Oilfield

张在振 张尊香 彭定亮 周红科 王艳珍

ZHANG Zaizhen ZHANG Zunxiang PENG Dingliang ZHOU Hongke WANG Yanzhen

中国石油大学(华东)地球科学与技术学院, 山东青岛 266580; 中国石油化工股份有限公司胜利油田分公司海洋采油厂, 山东东营 257237; 中国石油化工股份有限公司胜利油田分公司孤岛采油厂, 山东东营 257231

College of Geo-Resource and Information, China University of Petroleum in East China, Qingdao Shandong 266580, China; Offshore Oil Production Plant of SINOPEC Shengli Oilfield Company, Dongying Shandong, 257237, China; Gudao Oil Production Plant of SINOPEC Shengli Oilfield Company, Dongying Shangdong 257231, China

渤海湾盆地埕宁隆起带埕北低凸起断裂带埕北古7潜山,是东部断陷盆地基底造山期走滑挤压作用下形成的逆推构造。潜山地层为以前寒武纪花岗片麻岩为主的变质岩类,因经多期构造运动及风化改造,成为孔洞、裂缝发育的良好油气储层。但区域上这套地层岩性复杂、普遍发生混合变质结晶作用,储层具有极强的非均质性。利用埕北古7块潜山油藏开发过程中获取的丰富的岩心及电成像测井资料,开展了区块变质岩类岩石特征、储层物性及储集空间类型研究,结合区块构造特征及井间对比分析,对储层平面展布及纵向发育规律、影响因素进行了分析。埕北古7潜山变质岩具有粒状变晶结构,片麻岩构造。储层裂缝及溶蚀发育程度高,裂缝明显受构造及期次影响,发育具有平面差异性及纵向分段性。

Chengbeigu 7 buried hill is strike slip thrust structure, developed under the strike slip extrusion of the basement of the eastern fault basin during orogenic period in Chengbei low uplift fracture zone of Chengning uplift belt in Bohai Bay Basin. The strata of buried hill consist mainly of metamorphic rocks, dominated by granitic gneiss. Due to the multi phase tectonic movement and weathering alteration, excellent reservoirs with pores and fractures are well developed. However, this set of reservoir is serious in heterogeneity, with complex lithology, and mixed metamorphic crystallization has occurred commonly. In this study, by using the rich core and electric imaging logging data which obtained during the process of reservoir development, study has been conducted on the characteristics of metamorphic rock, the reservoir physical properties and the types of reservoir space. Through study of the structure characteristics and interwell correlation, analysis has been finished on the reservoir planar distribution, vertical development and the influence factors. The metamorphic rocks have granoblastic texture, gneiss structure. Reservoirs are rich in fractures and karsts, with planar difference and vertical partition, and the crack development was significantly affected by structure and tectonic stage.

国家重大科技专项"渤海湾盆地精细勘探关键技术"(2011ZX05006)

https://doi.org/10.3969/j.issn.1008-2336.2014.04.022