虚拟现实技术在鄂尔多斯东北部低渗透气藏勘探开发中的应用

The application of VR technology in E&P of low-permeability gas reservoir in northeastern Ordos basin

1. 中国石化石油勘探开发研究院南京石油物探研究所,江苏南京 210014;2. 中国石化石油勘探开发研究院,北京 100083

Institute of Geophysical Prospecting, SINOPEC Research Institute of Petroleum Exploration and Development, Nanjing 210014, China

在充分利用虚拟现实技术的基础上,提出了一种基于反射结构的地震属性技术。该技术的基本原理是:①通过分析研究区内钻井、测井、地质和物探等资料,建立高孔隙储层发育带的预测模式.寻找相对较厚的河道砂体;②运用虚拟现实技术浏览三维数据体,研究河道沉积的反射结构;③在地震属性体上,对河道砂地质异常体进行三维雕刻,预测砂体空间展布及纵横向叠置关系。根据预测结果,在鄂尔多斯盆地东北部部署了9口开发准备井,已完钻的7口井都钻遇了早二叠系下石盒子组盒1段-盒3段砂岩,并均获工业气流,平均产能为16.9×10⁴m³/d,其中1口井的产能达58×10⁴m³/d,为本区最高产井。

The priority of exploration was to search for high porosity zones because the reservoirs are thin, tight, low porosity, low permeability, and heterogeneous. By taking advantage of virtual reality (VR) technology, this paper presented a method called seismic attributes over reflection structure. Firstly, based on an analysis of drilling, logging, geologic and geophysical data, a forecast pattern of the development of high porosity zone was established for determination of relatively thick channel sand. Secondly, 3-D seismic data volume was browsed by VR techniques. As a result, it was found that channel deposits were of discontinuous lenticular reflection configuration. Finally, 3-D carving was implemented over channel sands on seismic attribute volume to delineate the spatial extents of the sands and highlight their configurations in vertical and horizontal directions. 9 well positions were recommended based on the predicted results. All of the 7 drilled wells encountered the targets, and produced commercial gas flow. The average gas production amounts to 169, 000 cubic metre, which is ten times higher than that of the previous production wells, and the highest production reaches as high as 589, 000 cubic metre per day.