摘要
为明确惠州油田火成岩潜山油藏储层品质及开发潜力,运用岩芯、薄片、成像测井等资料对研究区潜山储层天然裂缝特征、发育主控因素进行了研究。结果表明,惠州油田潜山储层发育NW、NE及EW向3组优势裂缝体系,以NW向裂缝体系为主,裂缝倾角49°~60°,主要为中-高角度裂缝。识别出构造缝、溶蚀缝及成岩缝3类裂缝,构造缝是主要的裂缝类型,溶蚀缝次之,成岩缝为孤立缝,对储层物性贡献意义不大。构造作用是裂缝发育的主控因素,岩性、断层及流体作用为次要因素,多期次的构造运动是潜山岩石破裂成缝的力学基础,花岗岩及闪长岩是裂缝发育的优势岩类,边界大断层控制下的裂缝发育范围约150 m,潜山内部次级断层控制下的裂缝发育范围约80 m。采用多元信息概率融合方法预测了潜山风化带裂缝优势发育区,划分出4类裂缝发育优势区。研究成果对惠州油田潜山油气藏储层评价及开发方案研究具有参考意义。
To clarify the reservoir quality and development potential of the igneous buried hill reservoir in Huizhou Oilfield,the characteristics,spatial distribution,and key controlling factors of fractures were studied comprehensively by using the data of core,imaging logging,and thin section.Results show that three groups of NW-,NE-,and EW-trending fracture systems are developed in the buried hill reservoirs,of which the NW-trending fracture system is dominant.The main frequency of the fracture dip angle is 49°~60°.Three types of fractures were distinguished,i.e.,structural fractures,dissolution fractures,and diagenetic fractures.The structural fractures are major types,followed by dissolution fractures,and diagenetic fractures are isolated and contributing little to the reservoir properties.The development of fracture was controlled by tectonic,lithologic,and fault and fluid action.Multi-stage tectonic movement was the mechanical basis of the fracture formation in the buried hill rock.Granite and diorite were conducive to the formation of fractures.The trap-control fault affected the fracture development in range of about 150 m,and the influence range of the secondary faults was about 80 m.Based on quantitative characterization of main controlling factors of fracture development,the dominant region of fractures in the buried hill was predicted by PR multiple information probability fusion method.In addition,four dominant fracture zones were recognized in the weathering zone in the buried-hill.This research provided an important reference for reservoir evaluation and development of the buried hill reservoir in Huizhou oilfield.
作者
邓永辉
戴建文
王华
衡立群
杨娇
蔡俊杰
DENG Yonghui;DAI Jianwen;WANG Hua;HENG Liqun;YANG Jiao;CAI Junjie(Shenzhen Branch of CNOOC(China)Ltd.,Shenzhen 518054,China)
出处
《海洋地质前沿》
CSCD
北大核心
2024年第1期11-19,共9页
Marine Geology Frontiers
基金
中国海洋石油集团有限公司“十四五”重大科技项目“海上低渗透及潜山油气田有效开发技术”(KJGG2022-0702)。
关键词
惠州油田
火成岩潜山
裂缝特征
主控因素
多信息概率融合
Huizhou Oilfield
igneous buried hill
fracture characteristics
primary controlling factors
information probability fusion
