陆相储层非均质性及其对油藏采收率的影响—以冀东高尚堡和胜利永安镇油藏为例

储层非均质性主要包括层间非均质性、层内非均质性和平面非均质性。通过冀东和胜利等油藏开发研究表明,层间非均质性导致注水开发中主力小层的单层突进、主力层过早水淹、非主力层油气动用程度低和驱油效率低;层内非均质性控制和影响单砂层内注入剂波及体积,直接决定水驱效率,是影响层内剩余油分布的关键因素;平面非均质性直接影响到注入水波及面积和波及效率,从而控制剩余油在平面上的分布。为此采用了细分开发层系、分层注水、开展流动单元精细研究等地质和开发措施,可以有效地降低各类非均质性对油藏最终采收率的影响。

Heterogeneity of non-marine reservoirs and its influences on recovery factor: take Gaoshangpu and Yonganzhen oil reservoirs in Jidong and shengli oilfields as examples

Reservoir heterogeneities mainly include interformational, intraformational and areal heterogeneities. The following understandings Jidong and Shengli oilfields. main sublayer, early watered are achieved from study of the Gaoshangpu deep reservoir and other reservoirs in The interformational heterogeneity may result in monolayer breakthrough in the out the main layer, low recovery percent in the non-major reservoirs and low oil displacement efficiency during waterflood development. The intraformational heterogeneity controls and affects the swept volume of the injectant in single sand layer, directly determines the waterflood efficiency, and is the key factor influencing the distribution of the remaining oil. The areal heterogeneity directly influences the swept area and sweep efficiency of the injected water, and thus controls the areal distribution of the remaining oil. Based on these understandings, several geological and developmental measures, including subdivision of layer series for development, separate zone water injection and detailed study of flow unit, are presented to effectively lower the influences of various heterogeneities on the ultimate recovery factor of oil reservoirs.