A Study On The Relationship Between The Low-High Structural Pattern,the Fault Characteristics And Hydrocarbon Reservoir In Gudao Projection And The Peripheral Edge Of The Recess

The Low-High structural pattern of Gudao projection and the peripheral edge of the recess and the relationship with fault in Zhanhua depression is the basis of formation and distribution of oil and gas reservoirs,but previous research in this area is relatively weak.This paper combined a large number of 3D seismic data and geological data had studied the Low-High structural pattern of the source bed, reservoir bed and overburded bed of Gudao projection and the peripheral edge of the recess in Zhanhua depression,this paper also analysised evolvement of the Low-High structural pattern in each sedimentary period, basising on them,we analysis the characteristics and activities of the faults in the study area. At last combining with the distribution characteristics of oil and gas reservoirs, we summary the relationship between the three regions of the concave-uplift area, the fault, the oil and gas reservoirs. The main conclusion as follows:1?Basising on the low point the and the high point of the source bed, reservoir bed and overburded bed of Gudao projection and its adjacent areas include Bonan sag,Sikou sag, Kenli sag, Gubei sag Gunan sag,we make off a new Low-High structural uni called "concave-uplift area surround Gudao" in Zhanhua depression. the characteristics of low point and high point are continual and inherited during the sedimentary period.2?Basising on the 3D seismic data,we map the sectional view of five faults,the characteristics of fault surface shape are sags and crests, steep and gentle. Guxi and Gunan fault extend from sag to the uplift,belond to fault intersect with the slope),the fault of Number 1 extend from sag to slopes, belond to fault parallel to the slope. The combined conformati of fault surface and the terrane on both sides of the fault are in accordance with the distribution of half-ridge-half-valley of the same tendency,but it is half-ridge-half-valley of the reverse tendency at the the upper part of the 3rd member of Shahejie formation in Guxi fault.The main activity period of the Gunan fault,Gubei fault,NO.1 fault and NO.2 fault is from the 3 member of Shahejie formation to Minghuazheng formation,but the activity period of the Gunan fault is the 3 member of Shahejie formation and the early 4 member of Shahejie formation.3?The shale oil and gas reservoirs mainly included 3 member of Shahejie formation and 1 member of Shahejie formation, distributed in the depressed areas. Oil and gas reservoirs are distributed in both the depressed area and the uplift area in concave-uplift area surround Gudao, Oil and gas reservoirs in 3 member of Shahejie formation mainly distributed in the depressed area, Oil and gas reservoirs in 1 and 2 member of Shahejie formation are mainly distributed in both the depressed area and the uplift area, Oil and gas reservoirs in Guantao formation distributed in he uplift area. Oil and gas reservoirs in the depressed areas distributed in the reservoir stratums which are acclivitous directed to the fault, oil and gas reservoirs distributed in the uplift area are primarily distributed in the reservoir stratums which are in the formation of the top part of the fault, connected with the fault. oil and gas reservoirs distributed in the reservoir stratum, whose combined conformati of fault surface and the terrane on both sides of the fault are in accordance with the distribution of half-ridge-half-valley of the same tendency or ridgelike.