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尼日尔三角洲前缘浊积扇朵叶复合体是西非深水区重要的勘探开发目标,但相关的沉积构成特征与油气水系统研究相对滞后.通过对地震相识别、地震属性刻画、岩心观察及钻井储层进行对比分析,并对研究区的朵叶复合体的沉积构成及储层地质特征进行了研究;依据MDT(mouldar formation dynamics tester)和DST(drill stem testing)测试资料,对朵叶复合体的油气水系统进行了探讨.K油田深海浊积扇朵叶复合砂体在地震剖面上外形呈丘状,内部为弱反射,与泥岩分界面为强振幅反射面,在空间上具有侧向和沿古水流方向迁移的多期叠置特征,平面上呈扇形或“舌状”;测井相以钟形或箱型为主,与周围泥岩呈突变接触;每期朵叶均由朵叶主体和朵叶侧缘构成,重力流水道较为发育.朵叶复合体中的块状砂岩是油田开发的优质储层,该类砂体分布面积相对较大,横向连续性好;目的层段发育多套独立的朵叶复合体油气水系统,每个单一的朵叶复合体油藏上下均受厚度较大的泥岩分隔,具有形成简单完整、统一压力系统、高速渗流能力且水体能量充足的高产油藏的有利条件.K油田朵叶复合体内部结构清晰、砂体侧向连通性好且具有统一油水系统,可作为大陆边缘三角洲前缘深水区富泥背景下深水油气田勘探和开发研究的典型范例.
The turbidite fan-leaf complex in the Niger delta front is an important target of exploration and development in the deepwater area of West Africa, but the related sedimentary features are relatively lagging behind the study of oil-gas and water systems.Based on the identification of seismic facies, characterization of seismic attributes, core observation and drilling storage And the geological characteristics of the reservoir were studied. According to the test data of MDT (moldar formation dynamics tester) and DST (drill stem testing) Oil-gas-water system.The turbidity fan-leaf composite sand bodies in the deep sea of K oilfield are mound-shaped on the seismic section and are weakly reflected inside, and the interface with mudstone is a strong amplitude reflecting surface with lateral and lateral Paleo-superimposed features of migrating paleocurrent direction are fan-shaped or “tongue-like” in the plane. The logging facies are mainly bell-shaped or box-shaped with sudden changes in contact with the mudstone around. The main body and the lateral margin of the leaf, and the gravitational waterway is relatively developed. The massive sandstone in the foliage complex is a high-quality reservoir developed in the oilfield. The distribution area of the sand body is relatively large and the lateral continuity is good. many Independent leaf-leaf complex oil-gas-water systems, each single leaf-leaf complex reservoir is separated by thick mudstones above and below, with high-yielding reservoirs that form a simple, complete, uniform pressure system with high-velocity seepage and adequate water body energy . The clear structure of the blossoming leaf complex in K oilfield and the good lateral connectivity of the sand body and the uniform oil-water system can be used as a typical example for the exploration and development of deep-water oil and gas fields under muddy muddy background in the delta front of continental margin.