致密气有效砂体预测技术及应用效果——以苏里格A区块盒8下段为例  

Prediction Technique of Effective Sand Body for Tight Gas and Its Application Effect——A Case Study of Lower Member of He8 in Block A,Sulige Gas Field

作　　者：文鹏 马瑶 陈帅 杨艳 王妍[5] 杨澜 Wen Peng;Ma Yao;Chen Shuai;Yang Yan;Wang Yan;Yang Lan(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an Shaanxi 710065;State Key Laboratory of Continental Dynamics,Northwestern University,Xi'an Shaanxi 710069;No.3 Gas Production Plant of PetroChina Changqing Oilfield Company,Ordos Inner Mongolia 017300;College of Petroleum Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065 [3]西北大学大陆动力学国家重点实验室,陕西西安710069 [4]中国石油长庆油田分公司第三采气厂,内蒙古鄂尔多斯017300 [5]西安石油大学石油工程学院,陕西西安710065

出　　处：《中外能源》2023年第2期27-34,共8页Sino-Global Energy

基　　金：西北大学大陆动力学国家重点实验室开放课题基金“基于机器学习的致密砂岩储层分类”(编号:21LCD01);西安石油大学研究生创新与实践能力计划资助项目“苏里格气田中部A区块石盒子组盒8段砂体展布规律及有效砂体预测”(编号:YCS21213181)。

摘　　要：苏里格气田是目前我国陆上探明储量规模最大的整装致密气田,A区块是气田重要的致密气资源产出区,研究区盒8下段主要为辫状河沉积,有效砂体厚度较薄,展布规律不清晰,通过常规地震反演技术无法对研究区有效砂体进行有效区分及准确预测。故本文在盒8下段沉积特征的基础上,通过使用不同频率的雷克子波,开展精细的层位标定,有效划分地层;利用Xu~White模型进行横波预测,建立了岩性、物性以及孔隙流体弹性参数与地震响应特征之间的联系。通过弹性敏感参数分析,利用纵横波速度比对泥岩、基质砂体及有效砂体进行区分;最终利用孔渗参数联合地质统计学反演结果,对苏里格气田A区块盒8下段有效砂体的展布特征进行预测及刻画。结果显示:有效砂体厚度为4~17.8m,整体上呈现南北向条带状展布,连通性较强,主要分布于研究区中北部及南部,预测结果与钻井符合率为86.3%,表明了该方法的可靠性,为苏里格气田及其他地区致密气开发提供了相关技术手段。Sulige Gas Field is uncompartmentalized tight one with the largest proven reserves on land in China at present.Block A is an important production area of tight gas resources,and the Lower Member of He8 in the study area is mainly braided river deposits.The effective sand bodies are thin with unclear distribution law,so it is impossible to effectively distinguish and accurately predict the effective sand bodies in the study area through conventional seismic inversion technique.Therefore,based on the sedimentary characteristics of the Lower Member of He8 in this paper,Ricker wavelet with different frequency is applied to fine horizon calibration and dividing the strata effectively.The Xu-White model is applied to the prediction of shear waves,the relationship between lithology,physical properties,elastic parameters of pore fluid and seismic response characteristics is established.Through sensitivity analysis of elastic parameters,mudstones,matrix sand bodies and effective sand bodies are distinguished by using P-S wave velocity ratio.Finally,the distribution characteristics of the effective sand bodies in the Lower Member of He8 in Block A of Sulige Gas Field are predicted and characterized based on porosity-permeability parameters and geostatistical inversion results.The results show that the effective sand body thickness is 4-17.8m,and the effective sand bodies are highly connected and distributed as a NS belt in the middle-north and south of the study area mainly.The coincidence rate between prediction and drilling is 86.3%,and the reliability of the method is demonstrated.It provides relevant technical means for the development of tight gas in Sulige Gas Field and other areas.

关 键 词：苏里格气田 致密储层 盒8下段 地质统计学反演 有效砂体预测 

分 类 号：P618.13[天文地球—矿床学]