Tectonic Developmental Feature And Its Control For Hydrocarbon Accumulation In Heidimao Reservoir Of AoNan Oilfield

AoNan Oilfield in the south of Aobaota Tectonic of the southern Daqing placanticline, this region has some natural gas drilling process shows in recent years.Heidimiao oil layer development in the k1n3,k1n4 layer, belong to Songliao Basin of the upper oil combination. According to study on the tectonic characteristics and its control to oil and gas in the Heidimiao oil layer.oil and gas exploration is not only better drployed and developed,it is also significant to reserrch on the whole area of Heidimiao oil layer.Through summarizing the previous research and on the basis of seismic ,drilling,logging and geologic investigation materials, This paper takes theories of structural geology,sedimentology and petroleum geology.Based on 3D seismicstructural interpretation techniques.Meanwhile,this paper further fulfills the characteristics of tectonic development and evolution,identifies the control effect of structure on hydrocarbon accumulation through using multi-disciplinary and multi-methods which include tectonics,sedimentation,sequence stratigraphy. Through the thesis research, the main accessto the following understanding:1) Study area consists of two concave and a lung composed of the west side of the Cologne syncline, north-south from near the east tower structure to the Aobaota and North East to the West nose structures. Ao north west to the east by the North West, nose structure and the formation of the faults cutting off the nose structure, the region with the NW structure on the great features of the small, mainly due to the late NW-trending faults activity decreased.2) Heidimiao oil layer in the plane of the fault also shows a certain regularity, North West, North West NW-trending faults with fault-intensive distribution. Eight faults in the plane was broken with a dense distribution, extending the length of the larger NW-trending normal faults are generally early faults in the study area for oil and gas migration control play a good role in NEE than the length of normal faults and extension Late the fault is generally small faults, play better regulation.3) Aonan area Heidimiao layer traps are mainly concentrated in Gulong and in the tower structure on the Aobaota. Gulong structural traps on the north area in the horizontal with a magnitude became smaller and gradually trend lower, vertically from the shallow deep with larger features.4)The study area there are four faults: k1qn deposition process, a strong fault activity; k1y also accompanied by an initial deposition of fault activity; Nenjiang end with a new sedimentary fault activity, fault activity is not strong, but produced Some new fault; k2m, a strong inversion of sedimentary deformation of the end of the faulting associated with the strong, the resurrection of both the early faults have produced large number of new faults.5) Faults in Heidimiao accumulation process in the reservoir plays a key role. On the one hand the channel upward migration of oil and gas, but also with the structure, with the formation of sand traps.6) Heidimiao k2m reservoir of the interface structure after the pattern of sedimentary strata and the deposition of the ancient terrain similar, while the next inversion of water erosion of sedimentary structures after a strong pattern of change, and tectonic framework of the current Similar.7) The work area showing stratigraphic thickness of the whole thickness of the Northwest, Southeast thin trend, indicating the deposition center of the study area in the northwest direction. Sand than the distribution from the point of view, the direction of the region, mainly in the northern region runoff.8) Block 61, from the ancient southern Portugal anatomy to see gas, sand body, structure, fault control hydrocarbon accumulation with each other, controlling factors for hydrocarbon accumulation. On the one hand and the sand body structure, fault anticline with the formation, structure - rocks, rocks - fault, broken nose traps for Qingshankou Nenjiang and discharged into the source rocks generated oil Heidimiao provide gathering places in the oil and gas ; the other fault is Qingshankou Nenjiang and source rocks and reservoir Heidimiao connects the trap in the "bridge". Therefore, in this sense, the sand body and structure, fault with the control Heidimiao oil reservoir formation.