Accurate Interpretation And Evaluation Of Complex Structure On Puzaoying Area Of Langgu Sag

The steady growth of oil and natural gas energy propelled the development of national economy, but with the deepening development exploration of our oil field, oil and gas energy steady-yield and increase yield faced with bigger and bigger pressure. at present,the various reservoirs has not been found is less and less, the geological problem is increasingly complex, the complexity of the exploration targets are also gradually increased. Detailed interpretation evaluation is an important link to solve the problem of all kinds of geological, it directly affects the understanding of complex geological characteristics and reservoir characteristics, at the same time, it will affect the effectiveness of exploration deployment.This paper research area is the langgu sag of puzaoying area, it is in the central of HeXiWu tectonic belt, is the transition zone of langgu sag and wuqing sag. The main oil producing layer is sand one and sand two segment, the target blocks in near the lower plate of HeXiWu fault, controlled by HeXiWu fault. although the structure of sand one, sand two segments in the region is complex, but the reservoir is fluvial facies sand body, the sandstone thickness is larger, good physical property, high output, and obtain multi-port high-yield Wells. But it is difficult to implement due to construction, evaluation of drilling one after another defeat, has restricted the further development process, so it is need careful, accurate implement structure. through interpretation evaluation the complex tectonic of langgu sag of puzaoying area, at the same time can also play a good role in guiding drilling and evaluation in the region, has a great value in practical production.Seismic exploration is the most effective methods and means to locate underground geological structure, the seismic data obtained from the seismic exploration can be used in underground strata tectonic interpretation and research. With continuous efforts and innovation of scientific workers,3D fine structural interpretation technology there will be a new leap forward, and its results will be to our country reservoir exploration and development has the very vital significance. In the process of this thesis research, closely combining with actual production unit. Make full use of seismic, logging and drilling data, and relying on oil exploration seismology, geology, structural geology, reservoir geology, seismic stratigraphy theoretical knowledge and so on, by means of interpreting the workstation, the research train of thought is from the qualitative to semi-quantification and quantification.The detailed interpretation evaluation research work mainly from two aspects to set about, namely, from the aspects of structure and reservoir were studied. In the study of structural form, the use of three-dimensional main line and across line, any line, time slice, from plane, section and multiaspect accurately proceed arguments, to ensure the rationality of the interpretation result and accuracy, which is to ensure that purpose layer form is reliable, breakpoint is clear. In reservoir study, on the basis of structural interpretation, applying the method of combine seismic attribute with seismic wave impedance inversion technology, make reservoir characteristics of the purpose layers clear. and then proceed evaluation and optimization of trap, and find out the distribution rule of oil and gas in this area, and provide favorable targets for next exploration.The main techniques applied to the research work are:fine stratigraphic contrast technology, fine structure interpretation, seismic attribute technology, wave impedance inversion, velocity field and so on. Fine stratigraphic contrast technology is on the basis of full digestion and absorption predecessors’ research results, guided by the basic theory of sedimentary petrology, selected earthquake geological interface with sequence interface characteristics, select the well has integrity horizon, lithology combination type and induction curve of morphological characteristics is typical representative, mark layer as the stratigraphic classification and correlation of the standard well kick in the drilling to proceed formation fine comparison. the high-precision synthetic seismogram calibration is an important part of fine structure interpretation technology, and it’s accurate or not directly affects the interpretation accuracy of horizon. In the process of interpretation should be composed of dot, line, face, body level accurately explain step by step, at the same time, to accurately grasp the fracture distribution characteristics of the work area, as far as possible choose the more sensitive such as coherence, the variance, edge detection, horizontal slice in this area and3D visualization technology to identify the fault and calibration. Seismic attribute technology is mainly refers to through the seismic attribute optimization selection to proceed seismic reservoir prediction. Seismic wave impedance technology refers to the seismic profile "conversion" impedance profile, this time we adopt sparse pulse inversion method. Velocity field technology can realize the transition from time domain to depth domain, through the establishment of fine and reliable velocity field, to obtain fine accurate depth structure diagram, is the ultimate goal of velocity field study.through this research work,we can be found on the structure of puzaoying area have the characteristics of generally east and west zoning, north and south blocking, the fracture structure of the area mainly based on fault block and fault nose structure to give priority to. HeXiWu fault controlled the sand one and sand two paragraph to dongying group sedimentary sand body and oil and gas migration and accumulation, the existence of HeXiWu fault play an important role to the formation and distribution of the middle and shallow layer gas reservoirs in the control. Look from the total amount,the HeXiWu structure belt with rich oil and gas resources, potential resources is great, for multiple series of strata laid a solid resource base, and it has great exploration potential.