渤海锦州南变质岩潜山油田储层分类及其剩余油分布规律

Reservoir classification and remaining oil distribution patterns of Jinzhou south metamorphic buried mountain oilfield in Bohai Sea

摘要

渤海锦州南油田为变质岩潜山油田,进入中高含水期,油井见水规律多样,剩余油分布复杂,稳油控水难度日益增大。根据取心、测井、薄片、生产动态等资料,采用三维物理模拟和数值模拟等方法,划分储层类型,讨论不同储层类型剩余油分布规律。结果表明:锦州南变质岩潜山油田分为背斜型、半背斜型及掀斜抬升型3类储层,受不同类型储层裂缝开度、密度、连通关系,以及油、水井距离等因素影响;背斜型储层采油井无水采油期长,剩余油主要富集基质系统和构造高部位裂缝系统,提高基质系统的渗吸作用,加强剩余油动用;半背斜型储层采油井存在优势见水方向,剩余油主要富集非优势见水方向的裂缝系统和基质系统,通过流场调控加强非优势见水方向的注水波及系数,提高剩余油动用;掀斜抬升型储层采油井易快速水淹,裂缝系统和基质系统剩余油大量富集,通过控制含水率上升提高剩余油动用。该结果对同类型潜山油田剩余油挖潜具有指导意义。

Abstract

Jinzhou South Oilfield is the metamorphic rock buried hill oilfield in Bohai Sea to be developed. Currently, it has entered a medium to high water cut period, with diverse water breakthrough patterns in oil wells, complex distribution of remaining oil, and increasing difficulty in stabilizing oil and controlling water. Based on data such as coring, logging, thin sections, and production performance, as well as methods such as three-dimensional physical and numerical simulations, reservoir types are classified, and the distribution patterns of remaining oil under different reservoir types are discussed. Results show that the Jinzhou south metamorphic buried mountain oilfield can be divided into three types of reservoirs: anticline type, semi anticline type, and tilted uplift type. Influenced by factors such as crack opening, density, connectivity, and distance between oil and water wells in different types of reservoirs, the production wells in the anticline type reservoir have a long period of anhydrous oil production, and the remaining oil is mainly enriched in the matrix system to enhance the permeability and suction of the matrix system and enhance the utilization of remaining oil. In semi anticline reservoirs, oil production wells have advantageous water injection directions, and the remaining oil is mainly enriched in fracture systems and matrix systems in non advantageous water injection directions. By regulating the flow field, the injection wave and coefficient in non advantageous water injection directions are strengthened to improve the utilization of remaining oil. In tilted and uplifted reservoirs, oil wells are prone to rapid waterflooding, resulting in a large accumulation of remaining oil in fracture and matrix systems. By controlling the increase in water content, the utilization of remaining oil can be improved. This result has guiding significance for tapping the remaining oil potential of similar buried hill oilfields.

关键词

变质岩潜山 / 裂缝性储层 / 储层分类 / 剩余油分布 / 锦州南油田 / 渤海油田

Key words

metamorphic rock buried hill / fractured reservoirs / reservoir classification / remaining oil distribution / Jinzhou South Oilfield / Bohai Oilfield

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基金资助

国家科技重大专项(2016ZX05058-001)