姜丽娜
JIANG Lina

• 1:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

为了定量揭示超压对三肇凹陷源下扶余油层致密油藏油气运聚的控制程度,根据源储位置关系、流体下排通道、流体排放机制等方面的差异,将超压驱动油气下排方式分为3种类型,其中超压通过断裂进行的幕式下排是油气大规模长距离穿层下排的主要形式。根据油气在断裂中向下运移的受力分析,建立超压驱动油气下排最大距离的计算公式。结合超压、排替压力以及最小启动压力梯度,建立超压驱动油气在致密砂岩储层中运移最远距离的计算公式。计算得出:三肇凹陷大部分地区下排深度都在200 m以上,最大深度可达831 m;在致密砂岩储层中油气运聚距离为200~800 m,运移最远距离为1 010 m。超压的强度决定油气下排深度以及在致密砂岩储层中的聚集规模。在超压驱动下的油气下排方式、下排深度和运聚距离定量研究的基础上,确定超压控制油气运聚的范围并建立致密油藏油气运聚模式。
In order to quantitatively reveal the controlled degree of the overpressure on the petroleum migration and accumulation of Fuyu dense oil reservoirs under the source rocks of Sanzhao Sag,according to the differences in the source rock and reservoir distances,downward expulsion channels the fluids,fluid expulsion mechanism and so on,the overpressure-driven hydrocarbon expulsion modes are divided into the three types,among them,episodic downward expulsion through the faults is the main form of the petroleum downward discharge in large scale and long distance. According to the force analysis of the petroleum downward migration in the faults,the calculating formula is established for the maximum distance of the overpressure-driven downward expulsion petroleum. Integrated with the overpressure,expulsion and displacement pressure and minimum starting pressure gradient,the calculating formulais built for the maximum migration distance of the overpressure-driven petroleum in the dense sandstone reservoirs.The calculation results show that the downward expulsion depths are more than 200 m in most parts of the sag,the maximum depth can reach 831 m; the petroleum migration distance in the is 200- 800 m,the farthest is up to1 010 m. The downward expulsion depth and accumulation scale in the dense sandstone reservoirs are determined by the overpressure intensity. On the bases of the quantitative researches on the downward expulsion forms,depths and migration-accumulation distances,the scope of the overpressure-controlled petroleum migration and accumulation is determined and moreover the migration and accumulation modes in the dense oil reservoirs are established.

关键词(KeyWords)： 超压;致密油藏;下排方式;下排深度;运聚距离
overpressure;dense oil reservoir;downward expulsion mode;downward expulsion depth;migration and accumulation distance

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E2603-01)

作者(Author): 姜丽娜
JIANG Lina

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