深海浊积扇朵叶复合体的沉积构成特征与油气水系统:以尼日尔三角洲前缘深水区K油田为例

发布时间：2018-05-10 13:07

本文选题：尼日尔三角洲 + 朵叶复合体　；参考：《地球科学》2017年11期

【摘要】：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.
[Abstract]:The turbidite fan leaf complex in the front of the Niger delta is an important exploration and development target in the deepwater area of West Africa, but the related sedimentary features are relatively lagging behind in the study of oil and gas water systems. By identifying seismic facies, characterizations of seismic attributes, core observation and drilling reservoir, the sedimentary composition of the leaf complex of the study area is formed. On the basis of MDT (mouldar formation dynamics tester) and DST (drill stem testing) test data, the oil and gas water system of the leaf complex is studied. The complex sand body of the turbidite fan leaf in the.K oilfield has a hilly shape on the seismic profile, the interior is weak reflection, and the mudstone interface is strong amplitude inverse. The plane has a multi stage superposition characteristic of lateral and along the direction of the paleo flow. The plane is fan-shaped or "tongue shaped" on the plane, and the well logging facies are mainly bell shaped or box type, and they are exposed to the surrounding mudstone; each leaf is composed of the main body of the leaf and the side margin of the flower, and the gravity flow channel is more developed. The developed high quality reservoirs have relatively large distribution area and good transverse continuity, and the target segments develop a number of separate leaf complex oil and gas water systems. Each single leaf complex reservoir is separated up and down with a large thickness of mudstone, which has a simple and complete formation, a unified pressure system, high speed percolation capacity and the charge of water. The favorable conditions for high yield reservoirs in the.K oil field are clear internal structure, good sand body lateral connectivity and unified oil-water system, which can be used as a typical example for the exploration and development of deep water oil and gas fields under the rich mud background of the continental margin delta front.

【作者单位】：中海油研究总院;中国地质大学资源学院;
【基金】：国家“十三五”科技重大专项(No.2017ZX05032-002)
【分类号】：P618.13

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