New Insight into Prediction Method of Deep Buried Source Rock Based on Seismic-Sedimentary Model

Summary Understanding the seismic characteristics and distribution of known source rock intervals and identifying new intervals is key for future petroleum exploration.This project is designed to investigate the distribution of known and potential Lower Cambrian source rocks in Tarim basin through seismic-sedimentary modeling.It is believed that the distribution of source rocks is controlled by sea level variation,palaeostructures and sedimentary environments.As the product of rapid sea-level rise during Sinian-Early Cambrian,it is generally carbonate slope-to-basin depositional systems,with high-quality source rocks developed in the mid-lower ramp.Besides,outcrop section and drilling data show that there is an “associated” sedimentation relationship between the Lower Cambrian and its underlying Sinian.The associated seismic reflection characteristics between them are further confirmed by drilling-seismic horizon calibration, the top and bottom of the associated sedimentary association have been tracked through plenty of 2D seismic data, and then build seismic-sedimentary model to calculating the thickness of source rock.This method of predicting the distribution of source rocks based on seismic-sedimentary model will decrease the uncertainty associated with the geological models constructed and improve the understanding of the viable petroleum systems.