致密砂岩气藏水平井测井评价——以鄂尔多斯盆地大牛地气田X井区为例

doi:10.11743/ogg20190514

摘要/Abstract

摘要： 致密气藏中有相当一部分水平井测井系列少、评价难度大，如何利用有限的测井资料有效开展水平井测井评价，对气藏高效开发具有重要意义。以鄂尔多斯盆地大牛地气田X井区为例，结合地质和生产动态等资料，利用水平井仅有的随钻伽马测井和气测录井资料开展测井评价研究，形成了基于伽马峰值和全烃有效指示因子的双参数水平井产能评价方法，有效提高了水平井产能评价精度，为同类气藏水平井测井评价提供了借鉴。研究认为，基于随钻伽马峰值分析能够有效对储层进行评价，大牛地X井区山西组和下石盒子组高产井目的层段随钻伽马值的分布均表现出了明显的单峰特征，而低产井则表现为双峰或不具有明显的峰值特征，主要与水平井钻遇砂体的稳定性有关。利用X井区气测录井资料，构建了基于全烃有效指示因子用于评价单井产能，并建立了山西组和下石盒子组水平井经济产能的气测录井指标。综合上述两种方法，形成双参数水平井产能评价方法，准确评价了X井区水平井单井产能。

关键词: 水平井, 全烃值, 随钻伽马, 测井评价, 致密砂岩气藏, 山西组, 下石盒子组, 大牛地气田, 鄂尔多斯盆地

Abstract: There are quite a few horizontal wells featuring insufficient logging suite,and thus are difficult to evaluate.However,the way to effective evaluation on horizontal wells with limited logging data is of great significance to successful development of gas reservoirs.We propose a productivity evaluation method based on two parameters,which are the peak value of Gamma ray logging and the effective total hydrocarbon indicator,because for many horizontal wells in the drill sector X of Daniudi gas field in Ordos Basin,only Gamma LWD and gas logging data are available.In addition,the method proposed also employs some of the dynamic geological and production data.It effectively improves the accuracy of productivity evaluation on horizontal wells,and may be applied to logging evaluation on horizontal wells in gas reservoirs of similar type.The study shows that the Gamma peak value is an effective indicator of reservoir quality:for the reservoirs in Shanxi and Lower Shihezi Formations of the Daniudi drilling sector X,the LWD Gamma data of high production wells are characteristic of single peak statistical distribution,while that of low production wells shows double peaks or no obvious peak,which is largely related to the stability of sand bodies encountered in drilling wells.Furthermore,using the gas logging data in the drilling sector X,we evaluated the single-well productivity based on the effective total hydrocarbon indicator,and propose a gas logging indicator for commercial productivity of horizontal wells in the Shanxi and Lower Shihezi Formations.By integrating these two indicators,we established the dual-parameter evaluation method for horizontal well productivity,and made an accurate prediction on the single-well productivity of the horizontal wells in the drilling sector X.

Key words: horizontal well, total hydrocarbon value, Gamma logging while drilling, well logging evaluation, tight sand gas reservoir, Shanxi Formation, Xiashihezi Formation, Daniudi gas field, Ordos Basin

中图分类号:

P631.8

魏修平,胡向阳,李浩,等. 致密砂岩气藏水平井测井评价——以鄂尔多斯盆地大牛地气田X井区为例[J]. 石油与天然气地质, 2019, 40(5): 1084-1094. doi: 10.11743/ogg20190514 Wei Xiuping,Hu Xiangyang,Li Hao,et al. An evaluation on logging data of horizontal wells in tight sand gas reservoir -A case study of drilling sector X in Daniudi gas field,Ordos Basin[J]. Oil & Gas Geology, 2019, 40(5): 1084-1094. doi: 10.11743/ogg20190514

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