海拉尔盆地贝尔凹陷基岩储集层流体作用机制与成岩改造  

Fluid interaction mechanism and diagenetic reformation of basement reservoirs in Beier Sag, Hailar Basin, China

作　　者：李娟[1,2] 卫平生 石兰亭[1] 陈广坡[1] 彭威[3] 孙松领[1] 张斌[1] 谢明贤[1] 洪亮 LI Juan;WEI Pingsheng;SHI Lanting;CHEN Guangpo;PENG Wei;SUN SonglingZHANG Bin;XIE Mingxian;HONG Liang(PetroChina Research Institute of Petroleum Exploration&Development-Northwest,Lanzhou 730000,China;Key Laboratory of Petroleum Resources of CNPC,Lanzhou 730000,China;Exploration&Development Research Institute,Daqing Oilfield Company Ltd.,Daqing 163712,China)

机构地区：[1]中国石油勘探开发研究院西北分院,兰州730000 [2]中国石油天然气集团有限公司油藏描述重点实验室,兰州730000 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油勘探与开发》2020年第1期45-56,共12页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司科技项目“海拉尔盆地富油气断陷综合研究与有利区带评价”（2017-5307034-000002）

摘　　要：基于岩心观察与薄片、阴极发光、扫描电镜等分析,结合稳定碳氧同位素组成、元素含量、流体包裹体、地层水等地球化学测试,研究海拉尔盆地贝尔凹陷浅变质火山碎屑岩基岩缝-洞型储集层流体作用机制与成岩改造。得到以下几点认识:①基岩发育风化段、内幕段两套储集层,内幕段存在优质储集层发育带,达到Ⅰ类储集层门限;②次生孔隙为碳酸盐矿物、长石、凝灰质等溶蚀形成;③成岩流体包括大气淡水、深部岩浆热液、有机酸以及含烃流体;④储集层成岩改造分为初始固结成岩、早期表生风化淋滤、中期构造破裂-胶结-溶蚀并存、晚期有机酸-岩浆热液叠加溶蚀等4个阶段,其中第2与第4阶段分别为基岩风化壳与内幕溶孔-溶洞型储集层的主要成因阶段。Based on analysis of core observation, thin sections, cathodoluminescence, scanning electron microscope(SEM), etc., and geochemical testing of stable carbon and oxygen isotopes composition, element content, fluid inclusions, and formation water, the fluid interaction mechanism and diagenetic reformation of fracture-pore basement reservoirs of epimetamorphic pyroclastic rock in the Beier Sag, Hailar Basin were studied. The results show that:(1) Two suites of reservoirs were developed in the basement, the weathering section and interior section, the interior section has a good reservoir zone reaching the standard of type I reservoir.(2) The secondary pores are formed by dissolution of carbonate minerals, feldspar, and tuff etc.(3) The diagenetic fluids include atmospheric freshwater, deep magmatic hydrothermal fluid, organic acids and hydrocarbon-bearing fluids.(4) The reservoir diagenetic reformation can be divided into four stages: initial consolidation, early supergene weathering-leaching, middle stage structural fracture-cementation-dissolution, and late organic acid-magmatic hydrothermal superimposed dissolution. Among them, the second and fourth stages are the stages for the formation of weathering crust and interior dissolution pore-cave reservoirs, respectively.

关 键 词：海拉尔盆地 贝尔凹陷 浅变质火山碎屑岩 基岩储集层 流体作用机制 成岩改造 

分 类 号：TE122.3[石油与天然气工程—油气勘探]