Study On The Characteristics Of Deposition And Oil Reservoir Of ES4-formation In ChenGuanzhuang Zone

This paper presents a method of classifying sequence based on the study results of predecessors and by sequence stratigraphy theories in Xian He Reservoir Region. On the basis of the method we have completed the sequence divisions of nearly 120 wells in the Nanpo reservoir zone and have set up the lithologic sequence framework of ES4 formation and gotten 3 of three-grade, 6 of four-grade sequences and 6 of sand bed groups. Through utilizing drilling cores, well logging data we accomplished the single well phase analysis and gained the results of the thickness chart of the formation, the ratio of sand and mud, the facies change and so on. The studies show that the ES4 formation is lacustrine sedimentation generally in this area and due to this background, it developed fan delta foreordained subfacies and brink lake beach dam subfacies depositions. By using main-phase draw, snap-edge tests, horizon slices and 3-D visual technology we completed the work of the seismic reflection structure elucidations of T2, T6, T6-1 and T7 so that evaluated 25 trap blocks, which take 85.9Km2 totally .On the base of raising degree of sophistication, we completed reservoir forecast of 400Km2 in the Nanpo zone and calculated 5 suits of reservoirs by using stochastic inversion and other advanced technologies. The study shows that the oil sources are adequate in this area and the formation distributions are in the form of fold in which the faults and the plane of unconformity were developed mainly. This paper sums up 5 kinds of oil-gas reservoir patterns in t ChenGuanzhuang reservoir zone and optimizes 14 targets which are beneficial for further exploration survey.