| Lamadian oil field is in the the north part of daqing placantieline. Delta plain and Delta front ocuur in this area.S,P,G are the most important oil layers,and there is no oil and gas in Fuyu oli layer because it is at enitial stage of exploration.Five wells have drilled in the target bed, but there is no well drilling in mid of the nose structure, so the understanding of drilling data does not meet the needs of deepening exploration.Based on the theories and means of sedimentology,sequence stratigraphy, structural geology,petroleum geology and so on,we did fine research of structural feature, sedimentary facies, reservoir conditions and pool-forming types by using the data of seismic,log and drilling, made clear reservoir forming condition and main controlling factors, provided evidence for orientation of exploration in northern lamadian oil field.The structural shape of Fuyu layer and the spread of faults were Recognized by fine interpretation of seismic horizons and faults, using 3-D visualization and identification of coherence cube.We divided Fuyu oil layer into 1 third-order sequence and 3 fourth level sequence in this paper which is based on the study of regional structure and sedimentary background,recognized fourth level sequence boundary in seismic data by Seismic Sedimentology. The sedimentary facies of 4th-order sequence have been characterized and at the same time we knew that the target zone mainly experienced from deltaic plain to deltaic-front. Oil and gas migration pathway and the efficiency of trap are the main factors of hydrocarbon accumulation by analysised reservoir forming condition in this area. And we optimized favorable target and proposed well position by comprehensive evaluation of trap. |
