The Study Of Prediction For The Carbonate Rocks In Moxi, Central Sichuan Paleouplift

The complexity of marine facies hydrocarbon accumulation in the land, the exploration of the Tertiary marine basin and low level of reason on th ve sea, led to the production of marine oil and gas reserves less than the continental oil and gas in China. The prediction is very difficult with reservoir deeply buried, strong heterogeneity, controlling factors of complex oil and gas accumulation, seismic data with low resolution and signal to noise ratio, although the exploration and development of the carbonate reservoirs has made significant progress in China.Based on the current exploration technology development in Complex area and reservoir prediction background, history, research situation, trends, knowledge and understanding,the paper close connection with the production practice, carry out pre-stack and post-stack integrated reservoir prediction, with Moxi area being the research object, aiming at the Ordovician ,Cambrian ,Sinianc avity-fracture carbonate reservoir being the target, with strong heterogeneity. First, summarizing geophysical response characteristic of complex reservoir, at the base of building the seismic-geologic model by fine calibration and structure interpretation, and developing seismic rock physics analysis and fracture prediction study. The second, developing the research about seismic attributes and inversion of post-stack and pre-stack post-stack systematically, in addition, analyzing controlling factors and distribution of oil and gas of Carbonate reservoir and pointing out favoural zone.From different seismic reservoir prediction methods, the most of reservoir distribution characteristics is consistent, but local is different. In order to reduce multiple solutions, by analysis the reservoir well log interpretation, reservoir prediction results, we predict favorable reservoir of the Cambrian Xixiangchi formation, longwangmiao formation and the Sinian dengsi formation with the way of attribute clustering with the principle of largest overlap reservoir is the most favorable. The favorable reservoir is a banded distribution characteristic in the plane, and shows a weak amplitude, high energy half decay time, the small correlation length, low resistance and strong absorption features by the attribute clustering results.The favorable reservoir is more developed inthe growth fracture.The Xixiangchi formation of Cambrian reservoir distribution is controlled by the ancient landscape, mainly distributes in the northern side of the slope site.The longwangmiao formation of Cambrian reservoir distribution is controlled by faults, not the ancient landform. It developes mainly in the fault zone.The dengying formation of Sinian reservoir distribution is controlled by the ancient landform. It distributes mainly in the relatively high position.