The Study Of Ordovician Carbonate Reservoirs Prediction In The Tarim Basin

In recent years, with the rapid development of China’s economy, rising energy demand. Carbonate reservoirs for oil and gas exploration and development, one of the most important part of the world, about half of the reservoirs for carbonate reservoirs. As an important reservoir basin in western Tarim basin, the Ordovician and Cambrian system development of the Marine carbonate reservoir, wide distribution and large area is good petroleum geology basis, has become the most important petroleum exploration of Tarim basin formation.In this paper, this work take the area in the Yingshan of the Ordovician with the Tarim central as an object the carbonate reservoir characteristics and oil and gas prediction method study. In seismic structure interpretation, on the basis of the modeling and analysis of drilling, cracks, research methods and seismic reservoir prediction, and the area of study on comprehensive evaluation and location. Through the above research obtained the following results and understanding:(1)Geological data collection and sorting the Tarim central and the surrounding area, through the well logging and drilling data, production of synthetic seismic records, and establish the seismic response characteristics, synthetic seismogram calibration, finish Lianglitage in the group with the Yingshan mountain horizon of tracking and explanation, at the same time for the drawing and interpretation of the fault, obtained Lianglitage in group top structure maps and the Yingshan mountain top structure maps.(2)Modeling of the study area and the high quality reservoirs are analyzed. Modeling design of the three sets of model, respectively from simple to complex, and can reflect the different reservoir condition. To forward modeling of three models, found that if the Yingshan group against the shell of reservoir development, the Yingshan mountain top if the earthquake response of the interface for the reflection of the group; if growth is strong reflection, etc. Success well for high quality reservoir seismic response pattern research, found that the tower area high-yielding well master accumulation factors including the type cave reservoir development degree and the degree of fracture development.(3)For the study area and reservoir inversion, seismic attribute analysis for fracture prediction and provide basis for oil and gas enrichment region recognition and classification. Based on Lianglitage group and Yingshan group of calculation, get the two layers of ants, coherent and curvature attribute graph, reveals the fault, fracture development and distribution characteristics. And has carried on the attribute by the RGB trichromatic composite showed that compared with the single attribute, after composite showed that can more accurate and detailed characterization of fault and fracture development. Based on statistics of stochastic inversion technique, obtained the reservoir thickness prediction in the study area map, in combination with drilling analysis found that more than 90% of coincidence rate is big, prove the effectiveness of the proposed prediction method, can provide reliable basis for carbonate oil and gas enrichment prediction.(4)Through comprehensive analysis, good for carbonate reservoir area location suggestion. In structural interpretation, modeling, attribute analysis and based on the results of reservoir inversion, combined with analysis of the geological data and well data, high-yield oil and gas Wells are situated near the structure transition belt, the micro fracture system and the development of karst reservoir are, coherent with presence of abnormal fracture belt, ants profile have thicker low velocity inversion profile abnormalities.The practical effect analysis, Tazhong area target layer of carbonate rocks with good oil and gas storage. By multiattribute RGB composite showed that can more meticulous with intuitive depict fracture development, improve the feasible degree of prediction. At the same time, based on the statistics of stochastic inversion technique, can be effective in the thin reservoir and drilling data velocity anomaly distribution under the condition of accurate prediction for predicting reservoir thickness distribution, can enhance the prediction accuracy of carbonate oil and gas reservoir.