Tectonic Evolution And Its Influence To Reservior In Zhuangxi Buried-hill, Jiyang Depression

On the basis of regional background of Zhuangxi area as well as the the 3D seismic data,t he distribution of structural layer and features of fracture properties are interpreted with the the drilling and logging data.And properties of fructure, activity period and the combination relations is confirmed, base on which we we make research on the evolution history of Zhuangxi area and its impact on reservoir development.Then fractal theory and coherence analysis is applicated to predict the plane reservoir distributionin lower Paleozoic of Zhuangxi brilled hill.Research shows that the tectonic evolution of Zhuangxi area not only obeys the universal law of the tectonic evolution in Jiyang depression, but also shows more particularities.During Indosinian,the north west thrust fault formed by the left-lateral strike-slip of Tanlu fault, who experienced the reverse and strengthening during Yanshanian Period, making the structures distribution of Paleogene in the north west direction mainly, and formed the North west tectonic weak belt, all of which became the main fractures which influence the tectonic evolution of zhuangxi area.Himalayan period is not only a period that Zhuangxi area reconstructed most strongly, but also a period the Zhuangxi buried hill formed and finalized.During the depositional period of Kongdian formation (Ek) and the 4th Member of Shahejie Formation(Es4),research area extended fully,which changed the position and occurrence of Guzhuangxi and produced Chengdong fracture in north east ,which also plays a skeleton role in the tectonic evolution afterward.At the same time under the influence of the fault system, Zhuangxi buried hill was formed with strong reformation of the stratum, thinning and repeating.The period of deposition of upper section of the 2nd member of Shahejie Formation (Es2) and Dongying formation (Ed) is the transition period of nearly ns-trending strike-slip role to north east to strike-slip.Under the participation of nearly ns-trending basal strike-slip faults activities persistently and dextral strike slip of the Tanlu fault, two large north east to fracture were formed in central and eastern of Zhuangxi buried hill.During Guantao formation (Ng) and Minghuazhen formation (Nm) , fracture of the control function abated and entered the faulted basin down warped stage. The main reservoir types in Zhuangxi buried-hill are fractured reservoir and solution type. Faulting has an important role in the control towards the reservoir development.The mechanics property, distribution characteristics, form of combination and the development degree of the fracture decided the mechanics property, distribution characteristics, form of combination and the development degree of the reservoir fracture .Research shows that the apparance of the inner fracture reservoirs have relationship with the detachment structure.The intralayer detachment produced amounts of structural crack groups between beds,which is favorable for the solution of water, and then layer reserviors come into being.It is pointed out that extensional linked fault system have has a significant influence, in terms of controlling and redeformation toward the Zhuangxi buried-hill reserviors. Based upon the understanding above, it is predicted that, area are advantage for development of fracture in study area where fracture fractal value are more than 1.4 with the application of fractal theory , which agrees well with the reservoir development zone found by the existing exploration achievement and application of crack coherence technology.