黔东南凯里—麻江—丹寨地区奥陶系红花园组古岩溶储层特征  

Characteristics of Ordovician Honghuayuan Paleokarst Reservoir in Kaili-Majiang-Danzhai Area,Southeastern Guizhou

作　　者：淡永[1,2] 梁彬[1,2] 曹建文[1,2] 张庆玉[1,2] 

机构地区：[1]中国地质科学院岩溶地质研究所 [2]国土资源部广西岩溶动力学重点实验室

出　　处：《海相油气地质》2013年第1期33-38,共6页Marine Origin Petroleum Geology

基　　金：国家地质调查项目"雪峰山西侧海相油气地质调查及综合研究工作"(项目编号:1212010782003)部分成果

摘　　要：黔东南凯里—麻江—丹寨地区(构造上位于黔南坳陷东北部)下奥陶统红花园组为一套生物碎屑灰岩。该区已发现的麻江古油藏尚未取得油气勘探进展。对区内多处露头剖面中—下奥陶统进行了宏观勘查和采样以及岩样微观薄片分析,证实该套地层曾发生古岩溶作用,并可识别出埋藏岩溶和风化壳岩溶两类古岩溶作用。基于这些岩溶剖面的对比分析,发现古风化壳岩溶受早中奥陶世古隆起及剥蚀时间控制,主要发育于古隆起区麻江古油藏一带,而其它地区为埋藏岩溶。认为古风化壳岩溶形成大量溶蚀孔洞缝,为红花园组提供了优质储层条件。此外在中—下奥陶统大湾组碎屑岩覆盖下的红花园组碳酸盐岩也可以发生埋藏岩溶并形成较好的岩溶型储层。红花园组在黔南坳陷东北部的油藏大多有过暴露或破坏。认为在坳陷西南部寻找古隆起区附近的上述两类储层应是油气勘探方向。The Lower Ordov ician Honghuayuan Formation is a set of bioclastic limestone strata distributed in Kaili-Majiang- Danzhai area （in the northeastem part of Qiannan Depression）, southern Guizhou. Pelroleum exploration is not advancing yet in the discovered Majiang oil-bearing paleoreservoir in this area. On the basis of observing and sampling from Middle to Lower Ordovi- cian outcrops and comparative analysis of thin sections of these samples, it is proved that paleo-karstification, in which both of bu- ral karstificafion and weathering-crust karsfification can be identified, was subjected in this set of limestone swam. According to comparing with these karstified outcrops, it is indicated that the weathering crust karst mainly develops in the Majiang oil-bearing paleoreservoir in the uplift area where it was controlled by uplifting and erosion during Early Ordovician period and the bural kars- tification develops in other areas except the uplift area. Dissolved pores, holes and joints are abundant in the weathering crust karst zone and the karsfificafion provides a nice condition of forming exellent reservoir for Honghuayuan carbonate rock. Besides, the Honghuayuan carbonate rock that is overlapped by Middle to lower Ordovician Dawan clastic rock may become a good karst reservoir if it was subjected by bural karstification. The other Honghuayuan reservoirs were ever exposed and destroyed in north- eastern part of Qiannan Depression. It is suggested that the direction of petroleum exploration should be put to these Honghuayuan paleokarst reservoirs near the paleo-uplift in the southwestern part of Qiannan Depression.

关 键 词：黔东南地区 黔南坳陷 奥陶系 红花园组 古风化壳 岩溶作用 岩溶型储层 储层特征 

分 类 号：TF112.23[冶金工程—冶金物理化学]