基于砂地比的复合河道沉积期次空间解析方法——以鄂尔多斯盆地苏里格气田ST密井网试验区盒8下(2)为例

doi:10.11743/ogg20190519

摘要/Abstract

摘要： 在对鄂尔多斯盆地苏里格气田储层精细描述研究过程中，经常遇到井间砂体尖灭位置无法判定的情况，这对砂体规模定量表征带来很大困难。为此，在精细综合地质研究基础上，形成了一套快速、定量确定单期河道边界尖灭位置的方法，利用砂地比确定不同期数河道叠置范围，并在此平面约束下，分析剖面位置多期河道组合情况，进而刻画复合河道在三维空间的展布特征。以苏里格气田ST区块密井网试验区二叠系中统下石盒子组盒8^下（2）小层为应用实例，结果表明：①小层细分为n个基本等厚的单层，i期叠置区域砂地比范围为（i-1）/n~i/n；②河道下切侵蚀、河道边缘砂体厚度变薄，可能造成局部解释叠置区域偏差，应对该区域进行适当调整，但不影响方法的整体适用性。该方法能够快速确定各单层河道空间展布范围，为储层定量表征和有利区预测提供技术支撑。

关键词: 砂地比, 空间解析, 沉积期次, 叠置区域, 单层, 复合河道, 盒8下, 苏里格气田

Abstract: Problems including the difficulty to determine the pinch-out location of cross-well sand bodies in the fine description of reservoir in Sulige gas field,Ordos Basin,usually bring great challenges for the quantitative characterization of sand body scale.To solve these problems,a method which may be applied to determine the pinch-out position of the single period channel in a rapid and quantitative manner,has been established following the fine,comprehensive geological research.That is,the sand-stratum ratio is applied to demarcate the scope of superimposing channels of different stages; under the planar constraints,we analyzed the multistage channel assemblage on the section position,and then described the distribution characteristics of composite channels in the three-dimensional space.A case study of the 2rd submember of the lower 8th member of Shihezi Formation in the infilled pattern test area of Block ST,Sulige gas field,has shown that:① a small-scale layer may be divided into n monolayers of almost equal thickness,and the sand-stratum ratio at the stage i ranges between (i-1)/n and i/n in the superimposing area;② due to the down-cutting of channels and the thinning of sand bodies on river edge,there may be partial deviations in the interpretation of superimposing area,but this does not affect the overall applicability of the methods,and appropriate adjustments to the area are necessary.It is concluded that the method proposed in the study can be applied to immediately identify the spatial distribution range of monolayer channels,and provide technical support for the quantitative characterization of reservoir and prediction of play fairway.

Key words: sand-stratum ratio, spatial analysis, sedimentary stage, area of superimposing sand bodies, monolayer, composite channel, the lower 8th member of Shihezi Formation, Sulige gas field

中图分类号:

TE121.3

王文胜,兰义飞,史红然,等. 基于砂地比的复合河道沉积期次空间解析方法——以鄂尔多斯盆地苏里格气田ST密井网试验区盒8^下(2)为例[J]. 石油与天然气地质, 2019, 40(5): 1135-1140. doi: 10.11743/ogg20190519 Wang Wensheng,Lan Yifei,Shi Hongran,et al. Spatial analysis of the sedimentary stages for composite channels based on sand-stratum ratio: A case study of the 2rd submember of the lower 8th member of Shihezi Formation in the infilled pattern test area of Block ST,Sulige gas field,Ordos Basin[J]. Oil & Gas Geology, 2019, 40(5): 1135-1140. doi: 10.11743/ogg20190519

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基于砂地比的复合河道沉积期次空间解析方法——以鄂尔多斯盆地苏里格气田ST密井网试验区盒8^下(2)为例

Spatial analysis of the sedimentary stages for composite channels based on sand-stratum ratio: A case study of the 2rd submember of the lower 8th member of Shihezi Formation in the infilled pattern test area of Block ST,Sulige gas field,Ordos Basin

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