石油与天然气地质 ›› 2002, Vol. 23 ›› Issue (3): 203-206.doi: 10.11743/ogg20020301

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碳酸盐烃源岩排烃模拟模型及应用——以鄂尔多斯盆地奥陶系马家沟组为例

陈义才1, 沈忠民1, 黄泽光1, 李延军2, 郭秀英2, 吕强3, 张军3, 石晓英3   

  1. 1. 成都理工大学, 四川成都, 610059;
    2. 西南石油学院, 四川南充, 637000;
    3. 长庆石油勘探局, 陕西西安, 710021
  • 收稿日期:2002-01-28 出版日期:2002-09-25 发布日期:2012-01-16

MODELING MODEL FOR HYDROCARBON EXPULSION IN CARBONATE SOURCE ROCKS AND ITS APLICATION IN PRACTICE: EXAMPLE FROM THE MAJIAGOU FORMATION OF ORDOVICIAN IN ORDOS BASIN

Chen Yicai1, Shen Zhongmin1, Huang Zeguang1, Li Yanjun2, Guo Xiuying2, L? Qiang3, Zhang Jun3, Shi Xiaoying3   

  1. 1. Chengdu University of Science and Engineering, Chengdu, Sichuan;
    2. Xinan Petroleum Institute, Nanchong, Sichuan;
    3. Changqing Administration Bureau of Petroleum Exploration, Xi'an Shanxi
  • Received:2002-01-28 Online:2002-09-25 Published:2012-01-16

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摘要：

碳酸盐烃源岩由于胶结作用发育,固结成岩较早,所以,其排烃作用并非一定以压实作用为主,而是多种作用互存。不同的演化阶段排烃方式各异,在高过成熟阶段以微裂缝排烃和分子扩散为主。以一维地质模型为基础,根据生、排烃质量守恒原理可以定量建立扩散排烃和微裂缝排烃的数学模型。鄂尔多斯盆地奥陶系马家沟组依此模型进行的模拟结果表明:马家沟组在早二叠世末进入生烃门限,三叠纪末达到生油高峰,早白垩世开始进入过熟干气阶段;现今累计排烃率为 60%～80%,其中,压实排烃、扩散排烃和微裂缝排烃占主导地位,水溶相排烃只占很小比例。

关键词: 碳酸盐烃源岩, 排烃模型, 微裂缝, 马家沟组, 鄂尔多斯盆地

Abstract:

With well development of cementation, carbonate hydrocarbon source rocks would be consolidated into rocks quite earlier, therefore, compaction effect is not merely chief one instead of multi-effects existence in hydrocarbon expulsion. Different evolution stages with various ways of hydrocarbon expulsion, in the higher-over maturation stage, micro-fissure hydrocarbon expulsion and molecular diffusion are believed to play a chief role. A mathematical model of diffusively hydrocarbon expulsion and micro-fissure hydrocarbon expulsion can be established quantitatively in line with the principle of mass conservation of hydrocarbon generation and expulsion on the basis of one dimensional geological model. Modeling results from this model indicate that Majiagou Formation in the Ordovician in Ordos basin had entered hydrocarbon generation threshold by the end of the earlier Permian and reached the peak of hydrocarbon generation in the Triassic, and began getting into the over saturation-dry stage in the earlier Cretaceous; Accumulative total hydrocarbon expulsion rate is 60%-80%, of which compactively hydrocarbon expulsion, diffusively hydrocarbon expulsion and micro fissure hydrocarbon expulsion are predominant whereas water soluble facies hydrocarbon expulsion occupies a small proportion.

Key words: carbonate source rock, hydrocarbon expulsion, microfissure, Majiagou Formation, Ordos basin

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