T17断块岩性地层油气藏高效勘探开发模式研究

Study on efficient exploration and development models of lithostratigraphic reservoirs in the T17 faulted block,Liaohe basin

断陷湖盆缓坡带是油气运移的优势指向区,具备形成岩性地层油气藏的优越条件.本文采用地球物理技术与石油地质分析相结合的方法,分析了T17断块岩性地层油气藏的地质特征与油气展布规律,认为:(1)油气成藏受不整合面、岩性及构造因素综合控制;(2)单个含油砂体的油层在上倾部位受储层超覆尖灭线控制,下倾方向受油水界面控制;(3)多个含油砂体叠和构成了岩性地层油气聚集区带,整个区带油气层纵向上呈阶梯状产出,平面上由构造低部位向构造高部位呈条带状展布.据此,总结该区油气藏的高效勘探开发模式,并应用到该断块的勘探开发实践中,取得了较好的效果.

The gentle slope of faulted basin is the favorable area for petroleum migration , where the accumulation condition is advantageous. This paper present a case study on the Tiejianglu oilfield, adopting new geophysical techniques combined with analytic technologies in petroleum geological research, analysis accumulation characteristics and hydrocarbon distribution of lithostratigraphic reservoirs in the gentle slope of faulted basin. The result shows that the controlling factors for hydrocarbon accumulation consist of unconformity, lithological condition and structure. In the updip direction, single oil-bearing sandbody is controlled by the overlap-denudation pitching-out line of reservoirs and in the downdip direction, it is restricted within the boundary of oil-water interface. Multiple superimposed oil- bearing sands form the lithostratigraphic oil-gas accumulation zones. The oil and gas reservoirs are distributed in a series of cascade downward and stripped from lower location to high location of the structure transverse. Accordingly, an efficient strategy of exploration and development for reservoirs is summarized have been applied to the Tjiejianglu oilfieled with satisfactory results.