渤海海域锦州南油田太古宇变质岩潜山储层特征及其发育模式

Reservoir Characteristics and Development Model of Archean Metamorphic Buried Hill in Jinzhou South Oilfield,Bohai Sea

为了掌握锦州南强非均质性太古界变质岩潜山储层发育的主控因素和模式,基于钻井取心、薄片、测井、地震以及分析化验资料进行了相关研究.结果表明:(1)研究区发育斜长片麻岩、二长片麻岩、碎裂岩以及辉绿岩等多种岩性,其中片麻岩以及碎裂岩是储层发育的主要岩性;构造裂缝、破碎粒间孔、溶蚀孔构成了多样性的储集空间,其中尤以构造裂缝占主导.(2)岩性、构造以及风化作用对优质储层分布均具有重要的控制作用,脆性矿物体积分数高的花岗片麻岩储层发育程度优于中基性侵入体,多期断裂叠加部位储层厚度大,古地貌高部位受风化改造强,对先期裂缝扩溶效应更加明显,进一步提升了储层的品质.基于上述分析建立了古构造主导下的储层发育模式,即平台区储层发育稳定,高斜坡区域储层发育较厚,凸起区储层厚度变化最大,低斜坡储层发育较薄,凹陷区储层发育较差.

Aiming at clarifying the strongly heterogeneous Archean metamorphic rock buried hill reservoir in Jinzhou south,the main controlling factors of the buried hill reservoirs are studied,and the development model of the buried hill reservoir in this area was established.Based on the data of drilling,coring,thin section,logging,and seismic,the characteristics of metamorphic buried hill reservoir are defined,the key factors controlling the reservoir development are discussed and the reservoir development model is established.The results show that:(1)Plagioclase gneiss,monzonite gneiss,cataclastic rock and diabase are developed in the study area,among which gneiss and cataclastic rock are the main lithology for reservoir development;Tectonic fractures,fractured intergranular pores and dissolution pores constitute a variety of reservoir spaces,among them tectonic fractures are the dominant.(2)Tectonic movement,lithology and weathering have an important control action on the high quality reservoirs distribution:reservoirs development degree of granite gneiss with high brittleness mineral content is superior to the basic intrusion;the reservoir thickness is large in the multi-stage fault superposition position;high position of the Paleo-geomorphology suffered strong weathering to further enhance the quality of the reservoir.Based on the above analysis,a reservoir development model considering tectonic position was established.Stably distributed reservoirs are developed in the platform area,thicker reservoirs are developed in the high slope area,the reservoir thickness changes fastest in the uplift area,the reservoir development in the low slope is relatively thinner,and the reservoir development in the depression area is the worst.