新疆石油地质

新疆石油地质 ›› 2008, Vol. 29 ›› Issue (6): 744-746.

• 油藏工程 • 上一篇    下一篇

东营凹陷南部油型气相态和干燥系数变化规律

包友书   

  1. 中国石化胜利油田有限责任公司地质科学研究院，山东东营257015
  • 收稿日期:2008-03-18 发布日期:2020-11-20
  • 作者简介:包友书（1972-），男，辽宁建昌人，工程师，石油地质，（Tel） 13589974406（E-mail）baoyoushu@126.com.
  • 基金资助:
    中石化科技攻关项目，济阳坳陷Es4-Ek 成烃与成藏条件研究（编号P05010）资助

The Change Rules of Existing Phase and Drying Coefficient of Petroliferous Gas in Southern Dongying Sag

BAO You-shu   

  1. Research Institute of Geological Sciences, Shengli Oilfield Company Ltd., Sinopec, Dongying, Shandong 257015, China
  • Received:2008-03-18 Published:2020-11-20

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摘要： 通过烃源岩生烃研究，总结了东营凹陷南部油型气生成特点和初次运移相态，并分析了二次运移过程油溶油型气出溶条件、影响因素及出溶天然气干燥系数的变化特点。油型气主要赋存相态取决于油气组成和系统温度、压力，并可以P-T 相图判断。原油出溶天然气的干燥系数比出溶前变高，细菌降解作用可以加速油溶气的出溶，并使油型气干燥系数增高。东营凹陷南部烃源岩生成油型气干燥系数较低（0.45～0.70），呈油溶相初次运移，二次运移过程中油溶气出溶的最大深度在1 500～1 400 m. 因此油型气气藏仅发育在1 400 m 以上，并具有较高的干燥系数（0.95～1）；而在1 500 m 以下，油型气主要溶解于油中，其干燥系数取决于烃源岩初始生成天然气的干燥系数和细菌降解活动程度。

关键词: 东营凹陷, 天然气, 相态, 气油比

Abstract: The generation characteristics and the primary migration phase of petroliferous gas in soutern Dongying sag are studied. The exsolution conditions and affecting factors of such a gas and the changes of its drying coefficient in secondary migration stage are analyzed. The existing gas phase lies on the components of oil and gas and the pressure and temperature of petroleum system, and can be judged with P-T phase diagram. The dry coefficient of exsoluted gas from oil becomes higher than that before exsolution. Bacteria degradation may accelerate the course of such a exsolution and allows the dry coefficient to be higher. The study shows that the drying coefficient of petroliferous gas generated from the source rocks in southern Dongying sag is relative low (0.45 ～0.70), being primary migration of the oil-soluble phase; during its secondary migration, the exsoluted gas occurs in depth of 1 400 ～1 500 m. So the petroliferous gas reservoirs can only be developed over the depth of 1 400 m, with higher drying coefficient (0.95～1); while below the depth of 1 500 m, the petroliferous gas mainly dissolved in oils, and its drying coefficient lies on the drying coefficient of natural gas primarily generated from source rocks and bacteria degradation degree in this area.

Key words: Dongying sag, natural gas, phase state, gas-oil ratio

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