Sand Body Description from Seismic Inversion Based on the Control of Braided River Reservoir Characteristics:Taking the lower of H 8 formation in Sulige gas field as an example
[Objective]The interference testing indicates that the sand body connectivity in the lower of He 8 forma-tion,the main gas-producing layer of the Sulige gas field,is poor. Under the condition of the dense well pattern (500 m×600 m) in the SD27-36 block,the distribution characteristics of sand bodies remain unclear.The purpose of this paper is to explore the characterization of sand bodies scale and stacking patterns,so as to clarify the connectivity of sand bodies between wells.[Methods]Modern river and field outcrop observations were combined with geostatistical inversion to optimize the inversion parameters and establish a characterization model based on the observation results,so as to accurately identify sand body boundaries and their overlapping relationships,and realize three-dimensional quantitative characterization of sand bodies.[Results and Conclusions]The observation shows that the sand body of the braided river single core beach in the lower of He 8 formation has various contact relationships such as isolation,butt and cut stack.,and the single sand body has a small plane size (200-600 m long,50-250 m wide),and the com-posite core beach sand body of a specific shape is formed by superposition and composite. The boundary of three-dimensional sand body characterization obtained by geostatistics inversion is clear,the lithology transition between the sand body and the well point is natural,the sand body size is similar to the sediment observation results,and the understanding of sand body connectivity aligns with the results of interference well testing at a rate of 87％. The results and methods of sand body characterization can not only guide the exploration and development planning of the Sulige gas field,but also provide reference for other braided river sand bodies.
Sulige gas fieldlower of He 8 formationbraided river depositiongeostatistical inversionsand body characterization
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