Analysis Of Sedimentary Microfacies And Flow Units Of SaPuGao Oil Reservoir Group Of Northern Xingshugang Production Zone

According to the "one set of methods, the six technology" accurate division and comparison of time units, the establishment of the formation of a single sand layer. On the basis of main body and foreign minister further subdivided as subject class I, subject class II and separate tables, gradual change table, the sedimentary microfacies types by five kinds of refinement to 7. And in microfacies subdivision based, microfacies identification standard by simply according to the thickness of the sandstone phase discrimination, perfect in sandstone pre judgment based on that basis to reflect the logging facies model integrated phase pattern drawing method. The method mainly comprises the following steps:(1) in accordance with the improvement of micro phase thickness judgment standard microfacies types;(2) by well logging identification and recognition uncertainty well point correction;(3) to front facies sedimentary theory as a guide by pattern drawing drawing plane sedimentary facies maps.In the fine dissection of the dense well network, the comparison method of single sand body "genetic movement" is used to solve the problem of "unstable sand body" in the stratum. Layer permeability heterogeneity variation coefficient and onrush coefficient, permeability of three parameters showed storage layer uniform; plane sandstone thickness of 2.0 m above the sand body is dendritic distribution and 2.0m under a lump, sheet distribution, hypertonic with dendrites and low permeability with radioactive lump. Storage coefficient, coefficient of permeability values much below 0.2, reflecting the front all kinds of storage layer of sand body storage capacity and percolation capacity are very poor, the water diversion channel and dam body relative advantages of storage and seepage channel and other sand storage and percolation capacity is weak. Currently commonly used macroscopic heterogeneity evaluation system already can not adapt to the front sub facies reservoir, should consider establishing suitable for front sub phase non homogeneity of the evaluation indicators and evaluation system in the heterogeneous microstructure research based.According to the storage coefficient and the seepage coefficient, the flow unit is divided into three stages. One of the A-class seepage coefficient is larger than 0.44, storage coefficient greater than 0.43; B level seepage coefficient between 0.08 to 0.44, storage coefficient between 0.16 to 0.43; C level seepage coefficient between 0 to 0.08, storage coefficient between 0 to 0.16. SII2 and PII3 examples show that a class is mainly distributed in the river channel, and the B level is mainly distributed in the side of the river, and the C level is mainly distributed in the channel. And the larger the channel scale, the higher the overall flow unit level is.