Sequence Strata Framework Study On Heidimiao Oil Layer In Talaha-Yingtai-Da'an

The latest theory and method of sequence stratigraphy and sedimentology are adopted in this paper. By using the data of seism, well logging, mud well logging and cores, the framework of sequence strata and sedimentary facies in the areas of Talaha-Yingtai-Da'an in the north of Song-Liao basin are analyzed and studied deeply, also the favorable reservoir and lithologic traps are researched and forecasted primarily.The studied area locates in Talaha-Yingtai-Da'an in the north of Song-Liao basin, and the tectonic location is in the Gulong depression and Longhupao-Da'an terrace in the west of Daqing placanticline. According to the traditional methods, the studied area can be divided into three parts. It is a whole third hierarchy sequence.According to the data of seism, mud well logging, well logging, cores and the principles of well correlation, this third hierarchy sequence is divided into three fourth-hierarchy sequences. The bottom sequence boundary is the lacustrine transgressional system tract, and the top boundary of the lacustrine transgression system tract is the maximum lacustrine flooding surface. The lithology is albert shale distributing in the whole basin. Highstand system tract is deep lake and half-deep lake sediment. The lithology is mud stone. Sometimes the sandbody of transgression and accretion can be found, equals to N2. the lacustrine retrogradational system tract equals to N3, and its upper is conversion surface , that is the surface from transgression to accretion. The bottom is lacustrine flooding surface.This paper gives emphasis to lacustrine retrogradational system tract of the third hierarchy sequence. According to the stacking patterns, the lacustrine retrogradational system tract is partitioned into three parasequence sets and nine parasequences, that is upper parasequence middle parasequence and bottom parasequence, equal to H2' , H22 and H23. Basing on these, the sediment faces and sandbody characteristics of each parasequence are studied, overlapping sandbody distribution structural characteristics, then the favorable reservoirs and traps are analysed and forecasted.Thirty one traps are found in the shrinking system tracks, including 10 tectonic traps 16 lithology traps and 5 combination traps. 20 traps of the 31 are drilled or found industry oil stream and form commercial pools, including 4 best traps, 13 better traps, 14 good traps.