松辽盆地敖古拉地区萨零组油藏特征及圈闭预测

CHARACTERISTICS OF FORMATION S0 OIL RESERVOIR AND TRAP PREDICTION IN AOGULA AREA OF SONGLIAO BASIN

松辽盆地敖古拉地区萨零油层组油气产量高,但油水关系复杂、油气富集规律认识不清。为了认清油藏特征,在井震资料结合的基础上,应用油藏解剖方法对油藏进行精细分析。研究认为:萨零组发育断层—岩性、岩性两种油藏类型,断层—岩性油藏即砂体的上倾方向被断层切割并遮挡而形成的油藏,岩性油藏即砂体的上倾方向尖灭而形成的油藏,剩余油气资源分布在断层—岩性、岩性油藏中,油藏高点处油气更富集;断层—岩性油藏沿敖古拉等5条断裂发育,分布在中部、西南部及东南部,岩性油藏受河口坝砂体控制,分布在北部和南部。利用砂体预测图与砂体顶面构造图叠合来识别断层—岩性、岩性油藏目标的方法,预测了30个有利勘探目标。

Although Formation S0 oil reservoir group is characterized by high petroleum production,the oil and water relationship is rather complex and moreover the accumulating laws of the oil and gas are unclear. In order to make clear of the characteristics of the oil reservoirs,on the basis of the integration of the seismic and well data,the fine anatomizing method is adopted to analyze the reservoirs. The achievements show that two types of reservoir are developed in the group: fault-lithologic and lithologic oil reservoirs; the former refers to the reservoir formed by the fault cut and barrier in the updip direction of the sandbodies; the latter refers to the reservoir accumulated by the pinchout of the sandbodies in the updip direction. The rest hydrocarbon resources are also distributed in the above two kinds of the reservoir,most oil and gas are enriched in the highs,the former is well-developed along thefive faults such as Aogula and so on,and moreover distributed in the central,southwestern and southeaster parts;the latter is controlled by the sandbodies of the river mouth bars and distributed in the north and south. By the overlaid integration of the sandbody predicting and top structural maps,the targets of the above two forms of oil reservoir are recognized,finally 30 favorable exploration targets are predicted.