The Research On The Features And Formation For Volcano-rock Reservoirin Jiyang Depression

Jiyang Depression is located in the shore of Bohai which is in the north of Shandong Province. It is made up by four large sags: Chezheng Sag, Zhanhua Sag, Huimin Sag and Dongyin Sag. Its length form east to west is 200 kms,its width form south to north is 124 kms and its area is 22000km2. Its structural section should be subjected to Bohai Bay oil and gas basin. It borders upon Luxi Uplift in the south, upon Chengning Uplift in the north and upon Donglin Rupture in the east. Jiyang Dpression should be a rupture vale basin which formed in Mesozoic and Cenozoic periods. So far form 1970s, a series of volcano-rock oil and gas reservoirs and shows have been discovered one after another in Huimin Sag, Dongyin Sag, Zhanhua Sag and Chezheng Sag .In 1997,Shengli Oil Field regarded Shang 741 volcano-rock oil reservoir as an important exploration. Thereafter, a series of rich and high-yield volcano-rock oil reservoirs have been discovered followingly in volcano-rock areas of Bin 674, Nuo 151 and so on. With the continual developmet of exploration for basins, the domain of volcano-rock oil and gas reservoir, as an unusual oil and gas reservoir, has displayed a vast exploring prospect. However, he anisotropy of volcano-rock oil reservoir puts a restraint on the exploration and exploitation of oil and gas.This thesis has a general description about the distribution and evolution of volcano-rock in Jiyang Depression and its features of petrology, petrochemistry, geophysics and volcano-facies and especially has an important illustration about the reservoir features of four kinds of volcano-rock oil reservoirs. This thesis starts from the volcano-facies and further analyses the eight control factors of volcano-rock oil reservoir. Based on these above four kinds of anisotropy reservoir models of volvano-rock reservoir have then been formed. Starting from the examples of oil reservoir in Jiyang Depression, this thesis also lists the affections of the magma-movement in the formation of oil reservoir and by analysis generates the control factors of rich gather and high yield for volcano-rock oil reservoir. At last, this thesis has an analysis on the exploring potential of volcano-rock oil reservoir in Jiyang Depression.