摘要
辽河坳陷兴隆台构造带中生界致密砂砾岩油藏受优势岩性控制明显,但研究区岩性复杂、厚度变化大,储层非均质性强,预测难度大,严重制约了勘探发现。为此,提出一种基于地震相控反演的致密砂砾岩优质储层预测方法。首先,通过井震结合开展精细层位标定,明确中生界内部层序的地震反射特征及地质含义;在此基础上,基于测井资料建立反映沉积相带及岩性变化的地质模型,并进行地震正演模拟,分析不同类型岩性组合的地震响应特征,优选对砂砾岩厚度敏感的地震属性,编制沉积相图;然后,基于孔、渗资料,明确中生界优势岩性序列,建立测井识别标准,优选岩性敏感测井参数;最后,在平面相带及地层层序的约束下,开展叠后敏感参数重构反演,刻画优势岩性分布规律。结果表明,10口验证井的岩性预测准确率达到79.8%,与地质认识吻合度高,为该构造带井位部署及储量升级提供了有力支撑。
The tight sandy conglomerate reservoir in the Mesozoic of the Xinglongtai tectonic belt in the Liaohe Depression is markedly controlled by the dominant lithologies.Nevertheless,the complex lithologies,large thickness variation,high reservoir heterogeneity,and difficult reservoir prediction severely restrict the exploration and discovery in the study area.For this reason,a method of predicting high-quality tight sandy conglomerate reservoirs based on seismic facies-controlled inversion is proposed.Specifically,the seismic reflection characteristics and geological implications of the sequence in the Mesozoic are clarified by fine horizon calibration through well-to-seismic integration.On this basis,ageological model reflecting sedimentary facies belts and lithologic variations is built with logging data.Seismic forward modeling is carried out to analyze the seismic response characteristics of the combination of different types of lithologies,select seismic attributes sensitive to the thickness of the sandy conglomerate,and compile a sedimentary facies map.Then,with porosity and permeability data,the sequence of the dominant lithologies in the Mesozoic is defined before the logging identification criteria are developed and the lithology-sensitive logging parameters are selected.Finally,post-stack inversion for sensitive parameter reconstruction is performed under the constraints of the plane facies belt and the stratigraphic sequence to characterize the distribution pattern of the dominant lithologies.The results show that the lithology prediction for the 10validation wells reaches an accuracy of 79.8%and is in good agreement with the geological understanding.This paper provides strong support for well placement and reserve upgrading in the tectonic belt.
作者
刘宝鸿
郭彦民
田志
陈昌
高荣锦
窦欣
LIU Baohong;GUO Yanmin;TIAN Zhi;CHEN Chang;GAO Rongjin;DOU Xin(Research Institute of Exploration and Development,Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S02期100-109,229,共11页
Oil Geophysical Prospecting
基金
中国石油天然气股份有限公司重大科技专项“辽河油田原油千万吨持续稳产关键技术研究”(2017E-16)资助
关键词
辽河坳陷
致密砂砾岩
地震属性
储层预测
相控反演
Liaohe Depression
tight sandy conglomerate
seismic attribute
reservoir prediction
facies-controlled inversion
作者简介
刘宝鸿,高级工程师,1969年生,1991年获中国地质大学(武汉)勘查地球物理专业学士学位,2003年获中国石油大学(北京)矿产普查与勘探专业工学硕士学位,目前在辽河油田分公司从事勘探部署研究及物探技术应用研究工作;田志,辽宁省盘锦市兴隆台区石油大街95号勘探开发研究院,124010。Email:478131932@qq.com
