| Damintun sag of liaohe basin tectonic belt is as the research object of this article.Damintun sag is one of the big three sag of liaohe basin, the location is in liaohe basin, northeastern in the planar triangle (irregular), has the characteristics of the south north wide narrow. The paleogene sedimentary area of about 800 square kilometers, damintun forward structural belt is located in on the west side of damintun sag. The damintun forward regional exploration degree is very low, Previous studies mainly using the old 3 d seismic data Due to the limitation of the quality of seismic data, the structure research is just stay on the large tectonic framework of understanding, the structural characteristics of fine understanding unclear, caused not in-depth analysis of hydrocarbon accumulation in the study area. At home and abroad on hydrocarbon accumulation conditions and distribution law of oil and gas research theory has been more mature, is based on structural features, sedimentary characteristics and hydrocarbon source rock and hydrocarbon migration research as the foundation. Oil and gas accumulation is the basic geological unit of trap, trap formation, development and distribution of the fault controlled the formation and fracture activity. Fracture characteristics of the fault activity in the formation reasons, there are differences, the forming of the type of trap also differ. The effect of faulting on the one hand, controlling the formation and the development and evolution of the structure, on the other hand holds the sedimentary changes within the sag. Different types of fault structural style of the sedimentary system development also has important control function. Hydrocarbon source rocks is develops in the inheritance and development of negative structure and form, fracture is the formation of hydrocarbon source rock boundary conditions and controlling factors of the tectonic units. Fracture properties, active features control development degree of the hydrocarbon source rock and hydrocarbon expulsion characteristics. The paper research content mainly includes (1) the stratigraphic classification and correlation; (2) fine structure interpretation; (3) the sedimentary characteristics and sand body distribution; (4) the accumulation of oil and gas reservoirs types of classes, accumulation pattern and control factors of reservoir research. Paper is the purpose of the study on the system on the basis of summarizing the existing geological understanding and the exploration results, strengthen basic tectonic characteristics research, understand the rule of distribution of oil and gas in the concave, points out favorable exploration target area. In order to achieve the above research contents and research purposes, this study intends to, from the perspective of the core observation, developmental features of sedimentary facies of the coring interval detailed observation and description, and through the microscopic observation, the appraisal of the casting thin sections and grain size analysis, sedimentary facies characteristics of the coring interval and the diagenetic features a detailed research. According to China’s oil and gas industry standards to establish reservoir classification standard, and by using conventional logging curve to establish different levels of other electrical storage or standard. Through sedimentary facies, sand body distribution, and distribution of oil and gas lateral comparison chart, discusses reservoir distribution characteristics of the vertical and horizontal. Combined with "life, reservoir and cap, transport, circle," analysis of reservoiring conditions, such as establishing this field forward area accumulation model, summarizes the oil and gas distribution, controlling factors for oil and gas enrichment is discussed, and predict favorable development zone of oil and gas. In the process of research, application of the three key technologies:(1) the sedimentary facies recognition technology; (2) the fine structure interpretation technology; (3) comprehensive laboratory analysis technology.Forward through the daminrun sag tectonic belt of oil and gas distribution laws are studied, mainly made the following findings:(1)The whole study area can see clear water back into the water depositional cycle characteristics. This constitutes reservoirs formed one of the important conditions, for the good students, reservoir and caprock.(2) Through the map structure, velocity analysis, horizon calibration, set up by LANDMARK software even well explain section a variety of means such as geological structure of this area were reinterpreted, further defined the forward area overall tectonic framework.(3) Through the drawing layer thickness isoline map of oil and gas, and on the analysis of the four sand reservoirs in the study area are controlled by two factors of structure and lithology, According to the different types of oil and gas traps can be divided into three types of reservoir:a class of lithologic reservoir structure, there is tectonic lithologic reservoir, category for lithologic reservoir. Buried hill section of the reservoir distribution are controlled by fracture development degree and the structure, so the reservoir type is with layered structure block reservoir construction(4) Oil and gas migration from source sub-sag around, near source sub-sag, priority of favorable traps to capture oil and gas, oil and gas enrichment degree is high. Oil and gas distribution is mainly controlled by geological structure, reservoir distribution, oil and gas supply and reservoir distribution, has the planar distribution of zonality and longitudinal distribution of the characteristics of universality and ring hollow(5) Good oil and gas supply conditions is the basis of reservoir formation in this area, this area has rich oil source supply, good reservoir-cap combination, good tectonic setting, such as reservoir forming conditions, but different tectonic position its oil and gas accumulation conditions and main control factors are also different, you can see from the structure at the major oil-bearing horizon for sand, sand three three, three or four segments, sand fracture tectonic belt are mainly distributed in advance and method of fracture tectonic belt, two tectonic belt good tectonic background and advantageous, reservoir and caprock, is an important reason of oil and gas accumulation in this area.(6) Divides the four sedimentary period of the sedimentary system, restored the ancient sedimentary environment. Sand geomorphology west and low in four period, low meteorological north, under the environment of water into the lake basin has the characteristics of north shennan shallow, forward of the main part in four tectonic belt of the early mainly alluvial fan, fan delta sedimentary system; The sand late four mainly alluvial-fluvial sedimentary system;(7) By constructing the implementation of, combined with sedimentary facies, sedimentary microfacies, oil and gas accumulation conditions and distribution law of oil and gas analysis, think forward structural belt of the west side of main body parts and slope-bottom land transition zone is a favorable target area, to find five to carry out the favorable traps.(8) Through the forward area control hydrocarbon accumulation conditions, reservoir and cap, circle, shipment, insurance, etc are analyzed in detail, points out that the sedimentary facies belt and the influence of the effective reservoir development zone, the distribution of oil and gas in this area, structure and reservoir conditions is to control the main controlling factors of hydrocarbon accumulation in the area.(9)In the study area at sand sand, sand three three, three or four in the region are relatively stable period of internal distribution of mudstone, the thickness is bigger, has good sealing performance, so that the lower part of the form good oil and gas reservoir., by contrast, trinity parts of segments of the reservoir sand is development, mudstone thickness is small, shallow, the region is not very stable, can’t have very good blocks on the lower reservoir, it is caused by Es31 parts of the reservoir are one of the reasons. |
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