| The offshore area of Beitang, which has a relatively low degree of exploration and a wide oil and gas prospect, lies in the north of Huanghua Sub-basin.With the focal point of exploration task of Dagang Oilfield shifts from the land to offshore area gradually, it is of vital importance to further the research of Beitang offshore area. Therefore,conbining the production reality of the oil field,we strengthened the comprehensive geological research of key structural zone and, pointed out the favorable exploration direction on the basis of constructing and depositting, oil and gas geological traits.Beitang offshore area is in northern fringe of lake basin in Huanghua depression which has strong fracture activity and got deeply stucked in the adjacent place of border falt and the centre of subside lies in the adjacent place of Chadian fault. Favorable source rock of Shahejie Fm. underparts are extensively distributed in this district;As the third member of Shahejie Fm has relatively stable deposition and its mid-lower part has a wide distribution of alluvial sand body,it still is the main target layer of exploration—The First Member of Shahejie Fm. to Dongying Fm. on both sides of Haihe fault can regarded as important exploration target stratum in the Xingang structural zone;The buried hill draping structure in the researched area have big oil and gas prospect and with advantage terms of reservior formation,the anticipated oil resource reserves of Xingang and Jiannan Districts are relatively great;Because of the extensive existence of C-P layers,both tilted block and horst of low mountains of the Himalayan period made disadvantage to the palaeozoic layers,the exploration of the buried hill needs discretion.Menwhile, this paper proposes disposing and constructing regional section moved towards vertically in the offshore area of Beitang district, reprocessing Caijiabao 2-D and Xingang 3-D seismic data, supressing mutiple especially and implementing traps and optimumly seeking exploration target. |
