摘要
白云凹陷中深层未探明油气资源潜力巨大,储层总体为低孔低渗储层,为了识别海域中深层有利储层的特征,寻找能用于指导有利储层宏观分布预测的主控因素,并对有利储层空间分布进行预测,对白云凹陷5A构造开展了研究.通过储层岩石学、储层物性特征及建设性成岩作用分析等微观方面与储层相带识别、厚层砂体发育的前积复合体预测、砂体与孔隙度地震反演及裂缝分布识别等宏观方面研究,对中深层有利储层“甜点”特征、宏观可识别的主控因素及空间分布规律开展分析.认为,白云5A构造辫状河三角洲平原与前缘中的分流河道和水下分流河道厚层中-粗砂岩发育次生溶孔和微裂缝,可作为储层“甜点”;反映沉积微相的砂体厚度及反映建设性成岩作用的裂缝是宏观可以识别的储层“甜点”主控因素,可通过地震外部形态的“上拱”、内幕结构的叠置及微地貌的低洼3个特征在地震上识别厚层砂体发育的前积复合体;综合厚层砂体识别、砂体及孔隙度预测、裂缝分布识别三方面成果,认为白云5A构造中深层C块东部为储层“甜点”发育区.
Middle-deep layers in Baiyun sag have great potential for unexplored hydrocarbon resources. Reservoirs in the middledeep layers are generally of low porosity and permeability. In order to describe the favorable reservoir characteristics, to find the reservoir macro-controlling factors, and to predict the special distribution of the favorable reservoirs, Baiyun 5A structure in Baiyun sag was studied. Taking middle-deep layers of Baiyun 5A structures for example, the microcosmic aspects such as reservoir lithology, reservoir properties, and constructive diagenesis and the macro aspects such as facies identification, prediction of progradation complex with thick sand, seismic inversion for sand and porosity, and fracture distribution recognition of reservoir are studied. Reservoir“sweet points” characteristics in the middle-deep layers, controlling factors that can be identified macroscopically, and special distribution of the“sweet points”are studied. It suggests that middle-coarse sandstones with big thickness in the distributary channels and underwater distributary channels in the Baiyun 5A structure developed secondary solution caves and microfractures, and these sandstones can be used as reservoir“sweet points”. Sand body thickness that represents its microfacies and fractures that represent the constructive diagenesis are controlling factors that can be identified macroscopically for reservoir“sweet points”prediction. Progradation complex with thick sand can be identified through the shape of“bump”, the superposed inside structure, and the low part of the microrelief in the seismic data. Combining the results of thick sand body identification, sand and porosity prediction, and fracture distribution recognition, the eastern part of the C block in the Baiyun 5A structure is recognized as the reservoir“sweet points”.
作者
谢晓军
熊连桥
白海强
黄饶
李飞跃
唐武
陈莹
Xie Xiaojun;Xiong Lianqiao;Bai Haiqiang;Huang Rao;Li Feiyue;Tang Wu;Chen Ying(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2022年第5期1635-1651,共17页
Earth Science
基金
“十三五”国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”(No.2016ZX05024002)。
关键词
“甜点”
成岩作用
主控因素
分布预测
中深层
白云凹陷
油气地质
sweet point
diagenesis
controlling factors
distribution prediction
middle-deep strata
Baiyun sag
petroleum geology
