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英西地区湖相碳酸盐岩角砾岩成因机制与勘探意义

Genesis of lacustrine carbonate breccia and its significance for hydrocarbon exploration in Yingxi region,Qaidam Basin
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摘要 为探究英西地区古近系下干柴沟组上段湖相碳酸盐岩高产稳产储集层类型及分布规律,明确下步高效勘探有利方向,通过对区内大量钻井岩心、薄片、岩矿测试及井-震资料综合分析,对区内碳酸盐岩角砾岩的成因机制及勘探意义进行了研究。英西地区碳酸盐岩角砾岩按成因可分为3类:①沉积角砾岩,为早期弱固结的碳酸盐岩受短期高能量的水体改造等地质作用影响,在洼中古低隆陡坡带发生事件性的滑塌破碎再沉积而形成;②成岩角砾岩,具似角砾结构特征,为准同生期弱固结的泥质碳酸盐岩内部自形、结晶粗大的膏盐类矿物结晶生长,造成围岩撑开变形或被切割而形成;③构造角砾岩,根据产状特征进一步区分为断层角砾岩和层间滑动角砾岩两种,均与狮子沟大型区域断层活动密切相关,两类构造角砾岩发育大量角砾间半充填孔洞和裂缝系统,是英西地区深层高产稳产储集层,在邻近区域厚层膏盐岩滑脱层之下可连片成带大规模发育,是下步高效勘探重要领域。从寻找规模碳酸盐岩储集体角度,沉积角砾岩和成岩角砾岩具有良好的指相意义。 To examine the reservoir type and distribution regularity of high-and stable-yield lacustrine carbonates in the upper Member of Paleogene Xiaganchaigou Formation of Yingxi region and to determine the high-efficiency hydrocarbon exploration direction,the origin and significance of carbonate breccia in this area were investigated based on comprehensive analysis of a large number of well cores,thin sections,rock and mineral testing and log-seismic data.The study reveals that the carbonate breccia has three origins:(1)Sedimentary breccia,formed by the event-related collapse,fragmentation and re-deposition of the early weakly consolidated carbonate rock in the steep slope of submarine paleohighs due to short-term high-energy water body reformation and other geological processes.(2)Diagenetic breccia,with breccia-like structure,formed by deformation or breaking of host rock due to growth of idiomorphic and coarse crystalline gypsum-salt minerals in the weakly consolidated argillaceous carbonate rock of the penecontemporaneous period.(3)Tectonic breccia,can be further divided into fault breccia and interlayer-slide breccia according to their occurrence characteristics,both of which are closely related to the activity of large-scale regional Shizigou Fault.With a large number of partially filled pores,vugs and fractures between breccia,the two types of tectonic breccia are high-and stable-yield reservoirs in deep Yingxi region,and may occur extensively under gypsum-salt detachment layers of adjacent areas,so they are the exploration targets in the next step.Sedimentary breccia and diagenetic breccia are of great significance in searching for large-scale carbonate reservoirs.
作者 王艳清 刘占国 宋光永 张永庶 朱超 李森明 王鹏 唐鹏程 WANG Yanqing;LIU Zhanguo;SONG Guangyong;ZHANG Yongshu;ZHU Chao;LI Senming;WANG Peng;TANG Pengcheng(PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;PetroChina Qinghai Oilfield Company,Dunhuang 736202,China)
出处 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2019年第1期100-108,共9页 Petroleum Exploration and Development
基金 国家科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”“致密油富集规律与勘探开发关键技术”(2017ZX05001-002,2016ZX05046-006) 中国石油科技专项“湖相碳酸盐岩成因模式与有利储集相带预测”“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(2016B-0303,2016E-01).
关键词 柴达木盆地 英西地区 湖相碳酸盐岩 碳酸盐岩角砾岩 储集层 成因机制 古近系 Qaidam Basin Yingxi region lucastrine carbonate carbonate breccia reservoir origin Peleogene
作者简介 第一作者:王艳清(1973-),男,吉林长春人,中国石油杭州地质研究院高级工程师,主要从事层序、岩相古地理及储集层研究工作。地址:浙江省杭州市西湖区西溪路920号,中国石油杭州地质研究院,邮政编号:310023。E-mail:wangyq_hz@petrochina.com.cn;联系作者:刘占国(1980-),男,河北承德人,中国石油杭州地质研究院高级工程师,主要从事沉积储集层综合研究。地址:浙江省杭州市西湖区西溪路920号,中国石油杭州地质研究院,邮政编号:310023。E-mail:liuzg_hz@petrochina.com.cn
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