Research On The Reservoir Forming Conditions In Buried Hill Of Ciyutuo

Ci-110 well successfully obtained high commercial oil and gas flow in buried hill after drilling, which open a new situation in CiYutuo buried hill exploration. Directing at buried hill many drilling wells have been deployed. But the whole exploration effect is not ideal, the complexity of oil distribution. The research regard Yici ciyutuo buried hill oil and gas favorable distribution area as the research target, and make full use of the existing data for predicting favorable areas through adjust their thinking, technological innovation.For buried-hill reservoi reservoirs, oil source condition, reservoir and hydrocarbon migration channel is the main control factors of oil and gas distribution in buried-hill. This time, we have three key factors as the research focus. Through the analysis of rock distribution, geochemical index and threshold of hydrocarbon generation, oil supply window and oil source correlation of the source, realise a comprehensive analysis of hydrocarbon source rocks. Through the transformation of ideas and technological innovation, according to buried hill weathering crust and different reservoir fracture development and distribution patterns inside buried hill, respectively, using curvature method and the method of seismic attribution we have carried on the comprehensive study on fracture law of distribution in buried hill, and divided the buried hill weathering crust and fracture development and distribution range inside buried hill reservoir. Combined with petroleum geological conditions of the study area, using a ray tracing technique, the Ciyutuo buried hill oil and gas migration path and favorable accumulation area are simulated. Simulation results visually and comprehensively reflects the oil and gas migration and accumulation process.In this study, the hydrocarbon generation, migration and accumulation of oil and gas were systematically studied and described in this paper. The main achievements and knowledge of the major innovations are as follows: 1. The weathering crust and inside have different crack development mode in buried hill of Ciyutuo. Weathering fractures are mainly developed in the northern, overall contiguous distribution; inside the main reservoir with fracture development, growth rate is low, the overall trend of scattered punctate ciyutuo buried hill. 2. Migration path of oil and gas and accumulation area indicates that the simulation and Niuju Changtan sag ciyutuo buried hill in the whole area oil, sag Cixi close filling accumulation, CI Bei depression to surrounding oil and to CI Bei depression as the center is radial, with fracture near oil source is still the oil and gas distribution of the profit distribution and convergence zone. 3. Ciyutuo buried hill oil and gas distribution and accumulation is mainly controlled by multiple factors, the ability of hydrocarbon source rocks, the main drainage of hydrocarbon oil supply window, structure of oil and gas control, storage layer fracture development scale, oil and gas migration conditions. The analysis thinks, ciyutuo in northern Qianshan had five weathering favorable oil and gas accumulation zone. Qianshan reservoir is on the fracture insider close to the oil source distribution, three hydrocarbon generation sag around there were five favorable exploration target area. In short, oil and gas distribution rule of show, ciyutuo buried hill there are still many favorable exploration targets, buried hill exploration still have good prospects and potential.