Characterization and Application of Tight Sandstone Reservoir Constrained by Horizontal Well - Taking the Southeast Block of Sulige Gas Field as an Example

Abstract

AbstractIn recent years, with the development of Sulige gas field, Ordos Basin has entered the era of “unconventional” resource development. With the increasing workload of horizontal wells in tight sandstone gas reservoirs in the basin, the long-term stable production of gas area is directly affected by the drilling rate of horizontal wells and effective reservoirs. In the process of horizontal well implementation, the conventional geosteering method is closely combined with geology, logging and digitization, forming a geosteering mode of “mainly guided by 2D profile model and supplemented by 3D geological model”. According to the data while drilling, the geosteering mode is timely corrected to guide horizontal well adjustment while drilling. Due to the frequent lateral migration of fluvial sand bodies and the rapid change of sand bodies between wells, there is often a “blind area” in the sand body scale prediction under the control of the existing vertical/directional well pattern, so it is difficult to describe the sand body accurately. By introducing the data of drilled horizontal wells and combining the traditional quantitative research method of sand body with horizontal well inter well prediction, the accuracy of sand body scale prediction of tight sandstone gas reservoir is further improved under the constraint of horizontal wells, and the drilling rate of horizontal reservoir and effective reservoir is improved, so as to better guide the effective development of tight sandstone gas reservoir in Ordos Basin.KeywordsTight sandstone gas reservoirFine description of sand bodyBlind area between wellsHorizontal well constraintReservoir characterizationEffective sand body lengthSulige gas field