ABSTRACT
M oilfield has a history of exploration and development for more than 30 years. The oil and gas reservoir has entered a period of medium and high water cut, with few high-quality reserves and difficult to exploit the remaining oil. Therefore, it is very hard to stabilize production, and the task of stabilizing production and increasing production in the long term is increasingly difficult. At present, it is tough to determine the remaining oil-gas enrichment area of the main oil-gas producing strata in the study area, and there is not much room for adjustment. In order to deeply understand the spatial characteristics of reservoir sand body, remaining oil distribution law, and main control factors in the M oilfield, and help tap the remaining oil potential in the old area. Based on the establishment of 3D geological modeling and combined with oilfield performance data, this paper studies the distribution law of remaining oil by integrating various methods for the Neogene of M gas field. The conclusions of this study are as follows: (1) The remaining oil is mainly distributed in the form of the remaining oil in the layer affected by heterogeneity and the remaining oil in the local enrichment controlled by the barrier and interlayer, and the remaining oil is mainly distributed in the X52-2 sub-layer. (2) The irreducible water saturation of reservoir rock in the M gas field is high and has obvious hydrophilic characteristics. (3) The controlled and recoverable reserves of the M gas field are 6.668 million tons and 2.7 million tons, respectively, and the cumulative oil production and cumulative gas production show a linear relationship. (4) The remaining oil distribution has four characteristics: enriched in the high part of the structure, controlled by the development degree of barrier and interlayer, controlled by interlayer difference, and formed by the imperfect well pattern.
