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渤海湾盆地南堡凹陷潜山已发现数口工业油气流井,深部潜山油气资源丰富,但该区潜山勘探一直存在有利区预测困难的难题。潜山上覆烃源岩的排烃分析可提供潜山油气勘探的重要依据,传统的排烃研究需大量钻井取样与样品分析测试数据,尝试利用声波时差与地球化学结合途径,研究烃源岩的排烃作用并预测有利潜山含油气区。通过对典型井的声波测井与地球化学研究,建立了南堡凹陷声波测井—地球化学指示排烃综合模型,应用该模型对南堡油田33口探井进行了排烃研究。结果表明,南堡油田2号、3号构造带潜山上覆烃源岩下排烃厚度最大、南堡1号构造带局部下排烃,4号与5号构造带潜山上覆烃源岩下排烃作用不太明显。以上排烃分析与目前潜山发现油气的分布相吻合,反映烃源岩对潜山油气有很强的控制作用。南堡凹陷潜山源控藏作用受控于烃源岩与潜山的接触关系、烃源灶位置、烃源岩成熟度、烃源岩中火山岩隔层与断层的发育等多种因素。综合排烃识别结果、源控藏分析等,预测潜山勘探有利区为南堡2-3号构造带,其次为南堡1号构造带。声波测井在排烃中的应用对于潜山油气勘探具有重要意义。
Several industrial oil and gas wells have been found in the buried hills in the Nanpu Sag, Bohai Bay Basin. There are abundant oil and gas resources in the buried hill in the deep basin. However, the buried hill exploration in this area has always had the difficult problem of predicting the favorable area. The hydrocarbon expulsion analysis of overlying source rock in buried hill can provide an important basis for oil and gas exploration in buried hill. The traditional hydrocarbon expulsion research needs a large number of drilling and sample analysis data, and attempts to study the relationship between source rock Hydrocarbon expulsion and prediction of favorable buried hill hydrocarbon area. Through the acoustic logging and geochemical study on the typical well, an integrated model of acoustic logging-geochemical indicator hydrocarbon expulsion was established in Nanpu sag. The model was used to study the hydrocarbon expulsion of 33 exploration wells in Nanpu Oilfield. The results show that the hydrocarbon accumulation under the overburden source rocks in No.2 and No.3 tectonic belts of Nanpu Oilfield is the largest, and that in Nanpu No.1 tectonic zone is the largest, while that in the No.4 and No.5 tectonic zones is overtopped The role is not obvious. The above analysis of hydrocarbon expulsion coincides with the distribution of oil and gas found in the present buried hill, indicating that the source rock has strong control over the buried hill oil and gas. The controlled reservoir potential of buried hill source in Nanpu sag is controlled by many factors such as the contact relationship between source rock and buried hill, the location of source stove, the maturity of source rock and the development of volcanic barriers and faults in source rocks. Comprehensive identification of hydrocarbon expulsion, source control and reservoir analysis, etc. It is predicted that the favorable exploration area for buried hill exploration will be No.2-3 tectonic belt in Nanpu area, followed by Nanpu No.1 tectonic belt. The application of acoustic logging in hydrocarbon expulsion is of great significance to the exploration of buried hill oil and gas.