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桩海地区潜山下古生界地层和储层分布具有明显的差异性,随着潜山油气田勘探的深入,这种潜山复杂储集空间的成因成为亟需解决的问题。以往对其储层及孔隙形成的解释,如风化壳成因和大气淡水成因,无法较合理地解释这一现象。研究发现,研究区具有埋藏岩溶作用发生的条件,包裹体均一温度和同位素方面的证据表明研究区存在埋藏岩溶作用且主要为压释水岩溶作用。本文对桩海地区下古生界潜山埋藏岩溶作用模式进行分析研究,归纳出3种模式:倾没端断面补给岩溶模式、翘倾端断面补给岩溶模式和背斜凸起两侧双向入渗岩溶模式。发现研究区下古生界潜山有利储层的分布受埋藏岩溶作用发育模式的控制。压释水首先进入潜山地层的良好储层,而压释水释出地层常形成淀积带,不具备储集条件或成为封堵层。结果表明,很多以前令人困惑的复杂储集空间的成因和下古生界储层和油藏的分布模式可用埋藏岩溶模式进行解释。
There are obvious differences in the distribution of the Lower Paleozoic Paleozoic strata and reservoirs in the Zhuhai-Zhuhai area. With the deep exploration of buried hill oil and gas fields, the formation of such a complex reservoir space becomes an urgent problem to be solved. The past interpretation of the reservoir and pore formation, such as the genesis of weathering crust and the genesis of atmospheric freshwater, can not reasonably explain this phenomenon. The study found that the study area has the conditions of burial karstification, homogenization temperature of inclusions and isotope evidence that there is buried karstification in the study area and mainly the effect of water-releasing karstification. In this paper, the buried karstification patterns of buried hills in the Lower Paleozoic of the Zhuhai-Hohai area are analyzed and analyzed, and three models are summarized: recharge karst mode at the incline section, recharge karst mode at the tilted section and bidirectional infiltration on both sides of the anticline Karst mode. It is found that the distribution of the favorable reservoirs in the buried area of the Lower Paleozoic in the study area is controlled by the development pattern of the buried karst. Pressurized water first enters the well reservoir of the buried hill, and the strata released by the pressure release water often form sedimentary zones, which do not have the reservoir conditions or become the plugging layer. The results show that the genesis of many previously confusing complex reservoirs and the distribution patterns of the Lower Paleozoic reservoirs and reservoirs can be explained by the buried karst model.