应用排烃强度预测深陷期砂砾岩扇体的含油性

APPLYING HYDROCARBON EXPELLING INTENSITY TO PREDICT OIL-BEARING POTENTIAL OF THE GLUTENITE FAN IN DEEP SAG STAGE

隋风贵 罗佳强 曹建军

SUI Feng-gui LUO Jia-qiang CAO Jian-jun

中国矿业大学, 北京, 100083 2. 胜利油田, 地质科学研究院, 山东, 东营, 257015

China University of Mining Industry, Beijing 100083, China 2. Geological Scientific Research Institute of Shengli Oilfield, Dongying, Shandong 257015, China

深陷期的砂砾岩扇体岩性油气藏是含气盆地勘探中后期油气勘探的重要目标,其含油性主要取决于有效烃源岩的排烃强度、砂体的储集性能、油气排驱动力等要素及其相互作用的结果。对东营凹陷已钻探的深陷期砂砾岩扇体进行研究发现,扇体的油气充满度与排烃强度密切相关;在油源充足的情况下,其成藏效果则主要受储集物性的影响。指出砂体的驱替效率指数>15%、且位于排烃强度>20×104t/km2内的砂砾岩扇体易于形成充满度较高的油气藏,而厚度<2m、孔隙度<12%的砂体则不利于成藏。该方法已成功地应用于东营凹陷深陷期砂砾岩扇体的油气勘探实践,并取得了较好的效果,它对陆相断陷盆地深陷期岩性油藏的勘探具有重要的指导意义。

Lithologic oil reservoir of the conglomerate fan-body developed in deep sag stage is the important target of oil-gas exploration in the mid-later term exploration in petroliferous basin, and it's oil-bearing potential is mainly dependent on the hydrocarbon expelling intensity of effective source rocks, the reservoir condition of gravel-sand fan-body and the result of their inter-action. It is found that the oil-gas full-up degree of fan-body has important relativity with the hydrocarbon expelling intensity, and it's accumulation effect is mainly affected by the reservoir condition if there is enough oil-gas resource in deep Dongying sag. The gravel-sand fan-body of displacement efficiency index over 15% and the hydrocarbon expelling intensity over 20×104t/km2is prone to form reservoir of high oil-gas full-up degree, and that the sand body of thickness over 2m and porosity over 12% is suitable for forming reservoir. The method has been applied to the oil-gas exploration of the gravel-sand fan-body in deep Dongying sag stage and has obtained better effect, Therefore it can be used to guide the exploration of lithologic oil reservoir in deep sag stage of continental basin.

国家青年自然基金项目(40003002).

https://doi.org/10.11781/sysydz200401047