多元微相控深水储层预测方法

Multi-Units Micro-facies Controlling Reservoir Prediction New Method in Deep Water Area

本文针对深水储层预测中的两个隐蔽而且关键的问题,即电测曲线无法识别深海—半深海泥与深水重力流沉积泥岩,以及深水重力流沉积体内部砂岩和泥岩地球物理响应特征非常接近,常规测井与地震联合预测方法无法描述深水重力流沉积体内部砂岩特征,作者提出了新的深水储层预测方法。该方法利用常规地震属性能够清楚识别和刻画深水重力流沉积体的优点,首先提出深水沉积研究面—线—点的新思路。第一步从地震资料入手,自下而上提取一系列地震属性,确定不同时期深水重力流沉积体的平面分布,建立深水沉积模式;第二步创新多元井震精确时深标定法解决了深海泥和深水重力流沉积泥无法进行电性区分的问题,即将地震剖面上深水重力流沉积体的顶底时间界面通过合成记录标到测井曲线上,进行单井相研究、沉积单元划分和不同沉积微相单元钻井砂地比的精确计算等基础工作;最后优选地震属性,拟合出不同沉积微相单元地震属性和砂地比的最佳关系公式。进而将深水重力流沉积体地震属性平面图按不同的沉积微相单元转化成该沉积体的砂地比平面图,实现对整个深水沉积体系砂体的精确预测。

The new method was created to solve the two concealing and key problems about reservoir prediction in deep water area,which are electricity log defect in recognizing deep water gravity flow sediments（DW fan）,especially claystone,and seismic data hard to be used to delineate the thin interbedded sandstone and claystone within DW fan.Firstly,according to obvious seismic reflective characteristics,put forward plane-line-point study method for DW fan.First step,based on the seismic attributes,build DW fan deposition model;second step,create reversed seismic to well tie to identify the top and bottom of DW fan on the well log section,research sedimentary micro-face,classify DW fan into five kind of sedimentary units,accurately calculate the net to gross（NTG） of five kind of units of DW fan.Then choose the appropriate seismic attributes to build their correlation with NTG,and transfer the seismic attribute map into the NTG map and sandstone thickness map with different sedimentary unit seismic attribute and NTG correlation formula.