| Liaohe depression Hai26-section is main block of Hai wai he oil field, construction location is in the south of Liaohe faulted's central uplift, which is a sub-uplift. It's a composite form's oil and gas accumulation zone.This article is fully draw on the basis of previous studies, use geology, sequence stratigraphy, and other basic theory as guidance and technical means, based on regional geological background analysis. Make full use of collected seismic, logging, logging data of production wells to analysis. Research on Hai26-section's characteristics of sequence stratigraphy and reservoir characteristics systematically. For the work area of Dongying formation, do the analysis of the geological background, introduced the development situation of Dongying formation. In accordance with the field criteria for the classification of the layer group, such as the "hump-shaped" silty mudstone, layer of the sign at the top of the development in the Dongying, contact with Guantao Formation unconformity, which is Guantao Formation and Dongying Formation's boundaries; "Jagged" low resistance mudstone, at the top of D2, which is D1 and D2's boundaries; "Folder nose" low resistance mudstone, at the top of D3,which is D2 and D3's boundaries, lithology is composition of gray green mudstone with siltstone and pelitic siltstone."V"mudstone, at the top of D2-1, lithology is gray green mudstone, apparent resistivity curves and curves of both sensors "V"-shaped; "W"-shaped mudstone, at the botton of D2-2,which is D2-2 and D2-3'S boundaries, lithology is composition of gray green mudstone with thin pelitic siltstone. In combination with logging data, research on sequence stratigraphy of Dongying Formation, including the identification and description of sequence- interface, as well as a description of the characteristics of each sequence.Hai26-section Dongying Formation four third-order sequence interface(SB1～4) and seven forth-order sequence(SB11～SB32) can be divided, and, we studied the sequence interface and sequence. Use two-tiered sequence's approach, divide "T-R" sequence, identify three long-term sequence (LSC1 ~ LSC3) and 10 mid-term sequence (MSC1 ~ MSC10),and through the integrated histogram and multi-well figure,we established Dongying Formation sequence stratigraphic framework in the region.On the basis of analysing paleontology, mudstone color, and sedimentary rocks of the type of structure characteristics, electrical characteristics curves, particle size, we divided the area of Dongying Formation's sedimentary facies and subfacies, microfacies. Hai26-section Dongying Formation is mainly delta depositional system, subfacies can be divided into delta plain, delta front and The former delta subfacies. Extensive develop micro-phase underwater distributary channel, estuary microfacies dams, diverting water between the micro-phase, lake mud microfacies. And studied the flat sedimentary microfacies distribution, sedimentary evolution, and development characteristics of sand bodies. Finally, established a model of rift evolution.According to observation core data and statistics particle size. Describes the Hai26-section reservoir sand body's rock compositional maturity, cement content, cement type, structural features. Through X-ray diffraction data analysis, etc, come to the reservoir characteristics of the clay minerals, the use of sand body characteristics, characteristics of properties, come to a different sedimentary microfacies and the relationship between changes in physical properties. The performance of the following: a. Subaqueous distributary channel reservoir microfacies, better physical properties, high porosity, high permeability reservoir; b. Sandbody between subaqueous poorly developed,reservoir properties are worse than the underwater distributary channel. And studied the heterogeneity of the reservoir and the reservoir pore structure. |
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