| Target region is a Oil-Gas exploration of blank region.After combining geology interpretion and analysising the outcome materials of surrounding oil fields and exploration zones we reach such conclusion as follow. Fistly,the studied zone locates in Gan qika is a right triangle which tip raised in north on a flat surface and inlays between Naiman-Tongyu zones and southeast depressions with wedge shape. It forms such structural reformation as two sags and one raising. Secondly, Mesozoic basins are J3-K fault-sag superimposed basin which developed on Paleozoic Era fold zones of geosyncline. Basin's developments through fractures, rifts and depressions three ages until recession and death. They finish their stuctrual evolutionary history in the Cretaceous period.Thirdly,according to the correlation of inner and outer strctrures locate in the researched region,we divided the target region into five sags such as Zhangqiang(Northern),Anle, Dalinzhen,Baogetu,Hule.They separately related to following sags:Qianjiadian, Longwantong, Zhangqiang(Sourthern),Changtu and so on.These sags fulled with Mesozoic stratum are excellent contrast each other.In addition, on the basis of founded stratum we founded and perfected stratum system of J3-K,meanwhile,confirmed the two levels Jiufotang and Shahai as main exporation level.According the relations between inner and outer sag,use layer and tructure as foundation, by means of compareble conditions as following:sedimentary, oil (oil source rocks development features and organic geochemistry characteristics), reservoir,caprock as a support, we can infer,speculate,estimate and evaluate the corresponding conditions of the sags.Finally,through compared quantitatively determine condition and orderly chose nature property condition ,we can confirm the favourable oil zones. Above-mentioned studies can pay a strong basises for the proceeding structural distribution and researching the strategic regions.
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