Sequence Stratigraphy Study And Selection Of Profitable Area In East Of Liangjing-the South Of Mutou Area

This paper will connect high-resolution sequence stratigraphy with the fine sedimentology. Then we unify the different level sequence interface, internal constitution and the spatial disposition, environment and process which it reflect, guided by the base-level cycle distinguish and sequence interface theory, establish high-resolution sequence stratigraphy framework. Its characteristic reveal that the alteration of the thickness of Fuyu oil reservoir base on lifting the base-level, influenced by the FuXin palaeohigh forming open ended space alteration.Through the comprehensive analysis of seismic, rockcores, welllogs, this paper studies the characteristics and identification sign of the different grade sequence interfaces and divide Fuyu oil layer into 1 long-term(lifting hemicycle), 4 middle-term, 13 short-term base-level cycle sequences. On the basis of the characteristics of the bottom surface of Fuyu oil layer, we divide it into 6 types to guide base level cycle correlation. Through the combination of short-term base-level cycle sequences equitime correlation and flat well network correlation technique, in the foundation of the identification of core mircofacies, we divide and correlate 812 wells in the area, finish the study of mircofacies and establish the model of well logging mircofacies. Short-term base-level cycle sequences revel that the alteration of the thickness of Fuyu oil reservoir is caused by the lift of the base-level. In this foundation, we discuss in detail every base-level cycle in vertical, lithologic and facies combination, architecture types and the overlay style characteristics. At the same time of studying of characteristics of the distribution of the oil reservoir, we combine the feature of the reservoirs, we confirm the profitable area with the help of the model of region accumulation model and third-level accumulation model. At last, combined with the feature of the distribution of water and oil, the mechanism of lithological oil reservoirs are analysed and single sand bodies are the key control factors, and determine advantageous exploration region. This will be solid base for the next increasing production and raising reserve volume.