叠前弹性波阻抗反演在JZ25-1油田变质岩储层预测中的应用  

Application of pre-stack elastic impedance inversion to metamorphic reservoir prediction in JZ25-1 oilfield

作　　者：陈晓东[1] 施泽进[1,2] 郑旦珠 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《油气地质与采收率》2015年第4期69-73,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目"薄互层油气藏地震多波波场分析研究"(41204091)

摘　　要：JZ25-1油田发育古潜山变质岩油气藏,裂缝储层是研究区最主要的储集空间,孔隙度是裂缝储层优劣的重要评价标准,有效地预测孔隙度及裂缝发育带是勘探开发该类油气藏的关键。结合前人研究成果,综合分析测井、地震资料,利用叠前弹性波阻抗反演对JZ25-1油田变质岩储层进行预测。通过建立横波波阻抗与裂缝储层孔隙度的关系,确定研究区裂缝储层的识别标准,进而分析其分布特征。研究结果表明,研究区古潜山地层发育风化壳、裂缝破碎带、相对致密带以及上、下2套储层,其中上储层发育于风化壳顶部,下储层发育于裂缝破碎带,下储层的裂缝相对较为发育,为研究区主力裂缝储层。研究区裂缝储层分布特征在平面上表现为沿主要断裂呈北东向块状展布,且主要分布于潜山构造高部位;剖面上表现为储层连续性相对较差,具有不明显的近层状特征。裂缝储层发育带主要集中于研究区中部和南部,南部孔隙度大于6.5%的局部构造高部位以及断裂发育带附近应为下部有利油气勘探区。The metamorphic buried hill reservoir that bearing hydrocarbons develops in JZ25-1 oilfield,in which the main reservoir space is fracture in the study area. The porosity is an important standard for fracture reservoir evaluation,so the key factors of reservoir exploration and development are effective predictions on fracture development zone and porosity.Metamorphic rock reservoir in JZ25-1 oilfield was predicted using pre-stack elastic wave impedance inversion by integrating previous research results and making a comprehensive analysis of well logging and seismic data. The recognition criteria of fracture reservoir in the study area were determined through establishing the relationship between S-wave impedance and fracture reservoir porosity,and then the characteristics of fracture reservoir distribution were analyzed. Research results show that weathering crust,fracture zone,tight zone and two sets of reservoirs develop in the buried hill formation in the study area. The upper reservoir develops on the top of the weathering crust,and the lower reservoir develops in the fracture zone which is the main fracture reservoirs in the study area. The fracture reservoir spreads along the NE faults,and mainly distributes at structural highs of the buried-hill horizontally,while in the profile,it is characterized by poor reflec-tion continuity and nearly layered formation. The better fractured reservoir develops mainly in the middle and the south of the study area. Regional structural highs in the southern part with porosity larger than 6.5% and parts near the fracture development zone should be favorable areas for the next oil and gas exploration.

关 键 词：古潜山 叠前弹性波阻抗反演 裂缝储层 孔隙度预测 变质岩 渤海湾盆地 

分 类 号：P631.445[天文地球—地质矿产勘探]