THERMAL FLUID ACTIVITIES AND THEIR EFFECTS ON WATER-ROCK INTERACTION IN DONGYING SAG
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摘要: 从气体地球化学、有机质热变、包裹体均一温度、古地温梯度、成岩矿物、重金属元素和岩浆活动等方面证实了东营凹陷发生了大量的热流体活动.热流体主要沿活动性较强的深大断裂运移至浅部, 并以侧向强迫对流为主, 同时具有多期次活动的特点.热流体通过改变温度场和地温梯度以及带入一些无机物质, 导致水-岩相互作用强度和类型的差异.Abstract: A large number of thermal fluid activities that occurred in Dongying sag can be proved in terms of gas geochemistry, organic matter thermal metamorphism, homogeneous temperature in fluid inclusions, palaeotemperature gradient, diagenetic mineral, heavy metal element and magmatic activity. The thermal fluids migrate along the deep and large faults whose activities are relatively strong to the shallow parts, and at the same time the corresponding migration pattern centers on the lateral forced convection. In addition, the thermal fluids in the Dongying sag are characterized by the multi-phase activities. The changes in temperature field and geothermal gradient and the mixture of some inorganic matters into the thermal fluids both result in the differences in water-rock interaction intensities and types.
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Key words:
- thermal fluid activity /
- waterrock interaction /
- Dongying sag
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图 2 东营凹陷实测温度与郝科1井包裹体均一温度比较
Fig. 2. Comparison of measured temperatures in Dongying sag with homogeneous temperatures of fluid inclusions in Haoke No.1 well
图 3 平方王CO2油气藏热流体活动示意(剖面图引自帅德福等[5])
1.闪长玢岩; 2.辉绿岩; 3.结晶基底; 4.页岩; 5.灰岩; 6.含烃热流体运移方向; 7.幔源和岩浆成因含CO2热流体运移方向; 8.变质成因含CO2热流体运移方向; 9.CO2气层; 10.油气层
Fig. 3. Sketch of thermal fluid flow of CO2-bearing oil-gas reservoir in Pingfangwang
表 1 东营凹陷泥岩/砂岩微量元素质量分数与主要岩类对比
Table 1. Comparison of mass fractions of some minor elements in some magmatites and shale stones with those in 10-6sandstones and mudstones in Dongying sag
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