Lithologicalpool Hydrocarbon Accumulation Conditions Research Of In Sha4 Member Of Qianjin Tectonic Belt

The lithologicalpool is an important field of oil and gas exploration. With the growing of the exploration degree of the each exploration area,The lithologicalpool appears more and more the important position and role.Qianjin tectonic belt is located at the southwestern of the Damintun sag, it is three-level tectonic units in the liaohe downwarped.The Sha4 member is relatively lower degree of exploration, but it is potential in exploration,It maily shows:First,the researched area is close to the Rongshengpu sag in its south,the Anfutun sag in its north,the oil source supply is enough,the source conditions is superior; Second, it's West Side lies the edge of the sag,there develops many times, multi-level widespread reservoir in the Sha4 of Paleogene System。The Exploration difficulty lies mainly in the sag margin area of gravel rock phase change quickly, it is hard to predict the effective reservoir rock in the Sand-conglomerate Bodies.So,this article is based on the theoretical guidance of the sequence stratigraphy,Comprehensive utilization earthquake, geology and logging data, and combined with sedimentology, stratigraphy, tectonic geology, petroleum geology, logging stratigraphy and seismic stratigraphy of different subjects like related theories and research methods, The maily research work is the tectonic characteristics of the Qianjin tectonic belt,the reservoir characteristics of the Sha4 member,the prediction of the effective reservoir and the accumulation conditions of the oil and gas,and the favorable hydrocarbon exploration zone is optimization,implementing and evaluating the exploration target,mading the follwing several aspecets of the main achievements:(1)The Sha4 member is nearly thickness deposition,the provenance comes from the west and south,and devlops the fan delta-lake delta,theⅣ,Ⅲsand groups lie the front of the fan delta,they are wide distribution in the area; In the depositional period of theⅡ,Ⅰsand groups,the fan delta is diminishing and the rang of the lake delta is increasing.(2) Applied the electric logging interpretation data cmbining resistivity and acoustic time logging,Establishing the division standard of the reservoir and the non-reservoir ,predicting the effective reservoir distribution in the Shen257 block and the main body of the Qianjin tetonic belt ,the effective reservoir of the Sha4 bottom distributes in the Qian32-Shen288 area.(3) It is the lithologic-structural reservoirs mainly in the Sha4 member.The reservoir is controled in the tectonic background, especially the reservoir quality,the tectonic highs.(4) The analysis of the Hydrocarbon accumulation thinks,in the faborable structural background,the key factor of the trap accumulation is the sedimentary facies and the reservoir conditons.The sedimentary facies control the formation and development of the lithology trap,the reservoir condition is the key factor of the trap accumulation,the caprock is the necessary condition of the trap accumulation.the lithology of the reservoir includes the sandstone,glutenite,breccia and so on.The reservoir qualityof the underwater branch of flow river is better,it is mid-porosity and low permeable ,and the maily oil formations。...