石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (2): 251-258.doi: 10.11743/ogg20110213

• 石油与天然气地质 • 上一篇    下一篇

辽东湾地区深层烃源岩排烃特征及资源潜力

  

  • 出版日期:2011-04-28 发布日期:2011-09-26

Hydrocarbon expulsion characteristics and resource potential of deep source rocks in the Liaodong Bay

  • Online:2011-04-28 Published:2011-09-26

PDF (PC)

1068

被引次数

20

摘要：

摘要：通过收集研究区深层烃源岩热解和有机碳等地化资料，利用地质门限理论为基础的生烃潜力法，对深层烃源岩的排烃特征进行了研究，并结合聚集系数法预测其资源潜力。建立了3类烃源岩排烃模型，其中，Ⅰ型源岩最早进入排烃门限进行排烃，排烃效率高于Ⅱ型和Ⅲ型源岩。沙河街组三段烃源岩早在沙河街组沉积末期开始排烃，主要以排油为主，累计排烃量为43.30×108 t，是研究区的主力烃源岩；沙河街组二段烃源岩在东营组沉积时期开始排烃，累计排烃量为22.6×108 t。深层烃源岩的总排烃量为65.90×108 t，预测资源量为21.06×108 t，其中石油预测资源量为17.12×108 t。研究结果表明，辽东湾地区深层油气资源潜力巨大，深层烃源岩以生油为主。辽西凹陷和辽中凹陷为两个富烃凹陷，位于两个凹陷之间的辽西凸起，具有双凹供烃之利，是油气成藏的有利区。

关键词: 关键词：深层烃源岩, 排烃特征, 生烃潜力, 资源量, 辽东湾地区

Abstract:

Abstract: Based on available geochemical data such as pyrolysis and total organic carbon (TOC), we studied the hydrocarbon expulsion characteristics of the deep source rocks by using the hydrocarbongeneration potential method，which is based on geological threshold theory. Three types of hydrocarbon expulsion models were established in this paper, with the typeI source rock expelling hydrocarbons earlier and more efficiently than the typeⅡand typeⅢ. The Es3 source rocks, the main source rocks in Liaodong Bay, started expelling hydrocarbons (dominated by oil) at the end of Shahejie Formation and the total amount of hydrocarbons expelled is 4.33 billion tons. In comparison, the Es1+2 source rocks started expelling hydrocarbons during the deposition of the Dongying Formation, with a total expulsion amount of 2.26 billion tons. The total amount of hydrocarbons expelled from the deep source rocks is 6.59 billion tons. The resource volume is estimated to be 2.106 billion tons, of which oil is 1.712 billion tons. The study results indicate that the resource potential of the deep layers in Liaodong Bay is very huge and dominated by oil. The Liaoxi salient located between the Liaoxi and Liaozhong troughs both of which are hydrocarbon kitchens is very favorable for hydrocarbon accumulation.