Application of High Precision 3D Geological Modeling in Horizontal Well Development of Tight Gas Reservoir

Abstract

The southeastern part of Sulige gas field is a typical tight sandstone gas reservoir with frequent channel bifurcations and intersections. The contact mode of single sand body is mainly multi-layer contact formed by lateral accretion. It has been proved by practice that the production of single well can be increased by tackling key problems in horizontal wells, and the development with less wells and more production can be realized. In recent years, based on the geological knowledge base, the combination of well and seismic, and the increase of horizontal well data and other geological constraints as much as possible, the formation of multi-disciplinary integration of high-precision three-dimensional geological model, the realization of sand body internal configuration step-by-step description, fine anatomy of sand body spatial superposition relationship and distribution characteristics, fine guidance of horizontal well deployment and LWD guidance. Through lithofacies and attribute model, the distribution law of gas reservoir is determined; combined with the calculation model of geological reserves abundance, the advantageous position of reservoir development is optimized, and the factors such as well pattern and well type are integrated to deploy high-quality horizontal well location; based on the identification of high-precision sand body and effective sand body, the design trajectory of horizontal well is optimized to effectively reduce the large-scale up-down adjustment in the drilling process of horizontal section Through comprehensive analysis of the model, fine adjustment and real-time steering are carried out while drilling performance of horizontal wells, and the drilling encounter rate of horizontal wells is increased by 5% - 10%. The application of the new technology of 3D geological modeling can realize the well location deployment with quality and quantity basis, and improve drilling speed and quality and benefit. Under the background of poor reservoir quality, the development effect of horizontal well is ensured.