Simulation Study On Hydrocarbon Accumulation Of The Langgu Depression

The Langgu depression is one of the five oil-rich depressions in the northern part of the Jizhong depression in the Bohai Bay Basin.After more than 50 years of exploration and research work,proved seven oil and gas fields,but also made a number of achievements and understanding.However,with the improvement of exploration degree,the difficulty of exploration is also increasing,and the exploration field and oil and gas reservoir type are changing constantly.In this situation,the traditional oil and gas geological research can not meet the current production needs,but requires a more advanced research methods and technical means,it is possible to obtain new exploration progress.Based on the fine tectonic interpretation,the three-dimensional tectonic model is established by using the tandem and fault stitching method.The advanced logging is used to evaluate the source rocks.Based on the three-dimensional seismic data platform and the comprehensive research results,Technology,combined with the sedimentary facies distribution,to determine the source rock model;the use of reservoir prediction technology to establish the reservoir model;for the characteristics of the formation area erosion,the use of logging sound wave time difference curve method,seismic reflection trend method and deposition boundary method,The formation of tectonic evolution model,the establishment of tectonic evolution model;through reservoir,fault and unconformity research,the establishment of the transport system model;all models of organic integration into one,the formation of three-dimensional integrated geological model.Based on the results of the study of the ancient heat flow and fault activity,the qualitative and quantitative analysis of "three fields" such as geothermal field,geostress field and ground pressure field is carried out to simulate the dynamic process of oil and gas generation,The potential of oil and gas resources in Langgu sag has optimized the exploration direction and has a certain guiding effect on the selection of oil and gas exploration stratum and zone.Through the simulation study of hydrocarbon accumulation,it is concluded that the oil and gas resources have a doubling of the oil and gas resources.Compared with the results of the third resource evaluation,the hydrocarbon generation and resources of this simulation have increased greatly,but the spatial distribution of oil and gas resources in the depression has obvious difference.First,there are obvious differences in the resources of each zone.The oil resources are mainly concentrated in the middle of the middle of the sand to the upper four sections of the sand,the natural gas resources are mainly concentrated in the middle of the sand and the ancient Paleogene;The study shows that the Daluquan tectonic belt and the Hexiwu tectonic belt are the main distribution areas of the remaining oil resources.Among them,The middle section of Shahejie Formation in the slanting and amber camp area is the new area which is yet to be found further.The lower section of Shahejie Formation is the most favorable oil and gas resources in the lower part of the Liuquan tectonic belt.Oil resources replacement area and successor layer;In addition,the area of complex fault block and buried hill area still has huge exploration potential.