Configuration-based fine description of high-quality sand bodies in tidal-flat bar-Taking the tight sandstone reservoir in the 2<sup>nd</sup>member of the Taiyuan Formation in D-17 wellblock in Daniudi gasfield as an example

Yang Chenyu; Tian Jingchun; Zhang Xiang; Lin Xiaobing; Liu Xugang; Cao Tongsheng; Xing Haoting

doi:10.11743/ogg20150209

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Configuration-based fine description of high-quality sand bodies in tidal-flat bar-Taking the tight sandstone reservoir in the 2^ndmember of the Taiyuan Formation in D-17 wellblock in Daniudi gasfield as an example
Vol. 36, Issue 2, Pages: 248-254(2015)
Online First：08 April 2015，

Published：2015
DOI： 10.11743/ogg20150209
稿件说明：

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DOI：

Yang Chenyu, Tian Jingchun, Zhang Xiang, et al. Configuration-based fine description of high-quality sand bodies in tidal-flat bar-Taking the tight sandstone reservoir in the 2^ndmember of the Taiyuan Formation in D-17 wellblock in Daniudi gasfield as an example[J]. 2015, 36(2): 248-254. DOI: 10.11743/ogg20150209. DOI：

摘要

以大牛地气田未开发区（D17井区）太原组2段潮坪沉积为研究对象，基于测井、岩性等特征分析，对潮坪砂坝进行了精细刻画，共识别出了砂坝主体、砂坝侧翼及砂坝侧翼叠置3个沉积微相单元，并建立了沉积微相-岩相- 测井相-物性-非均质性-试气成果响应模板。对比结果显示，砂坝主体微相岩性主要为（含砾）石英粗砂岩及岩屑石英砂岩，测井曲线具光滑箱形；砂坝侧翼微相岩性主要为中-细粒砂岩岩屑砂岩、岩屑石英砂岩，测井曲线为齿化箱形、齿化钟形以及漏斗形。根据砂体组合类型，区域上划分出了砂坝主体型砂体带与砂坝侧翼型砂体带。前者砂坝宽度为6～8 km，砂体平均厚度为14.5 m，砂地比平均值为0.53，平均渗透率为0.48×10

-3

μm

。后者砂坝宽度为4～6 km，砂体平均厚度为10.56 m，砂地比平均值为0.36，平均渗透率为0.36×10

-3

μm

。砂坝主体型砂体带砂体发育规模大，分布范围广，砂体物性好，中等非均质性，试气成果明显，应作为优先开发的地区。

Abstract

Logging data and lithological analyses of the tidal-flat depositsin the 2

member of the Taiyuan Formation(D-17 wellblock)in the Daniudi gas field revealed three sedimentary microfacies:mainsandbar

sandbar flanking and overlain sandbar flanking-.A response-template of sedimentary micro-facies-lithofacies-logging facies-physical property-heterogeneity-gas test was also established.Correlation shows that the main sandbar is mainly gravel-bearing quartzose laterite and lithic quartz sandstone

corresponding to smooth-box type logging curves;and thelatter two are mainly medium-to fine-grained lithic sandstone and quartz sandstone

corresponding to dented box-and bell-shaped or funnel-shaped logging curves.Regionally

two belts were identified based on sand body assemblage types:sand body belt consisting main sandbar and sand body belt consisting sandbar flanking.The former is 6-8 km wide

and has an average thickness of 14.5 m

an average net-to-gross ratio of 0.53 and an average permeability of 0.48×10

-3

μm

.The latter is 4-6 km wide and has an average thickness of 10.56 m

an average net-to-gross ratio of 0.36 and an average permeability of 0.36×10

-3

μm

.The former with its well developed and widely distributed sand bodies is considered to be a better development target as it has better physical properties and strong heterogeneity and good gas testing results.