基于盆地模拟的方法研究东濮凹陷古近系馆陶组热储温度分布特征

Research on the Temperature Distribution Characteristics of Paleogene Guantao Formation Heat Storage in Dongpu Depression Based on Basin Simulation

东濮凹陷的主要热储包括新近系明化镇组、古近系馆陶组及东营组碎屑岩和奥陶系碳酸盐岩,已有的研究缺少每套热储的温度分布的研究,制约着该凹陷地热能勘探开发的评价。因此,本文以地温梯度、大地热流和岩石热物性参数为基础,利用一维稳态热传导方程计算得到研究区馆陶组顶部和底部的热储温度,其顶面温度在63℃~106℃,西部斜坡带、西部次凹和中央隆起带温度较高,东部次凹和兰聊断裂带温度较低;底面温度在65℃~120℃,具有南部热储温度高于北部的特征。馆陶组砂岩含量高、孔隙度及渗透率高,可以形成几类热储,发育有中–低温型地热能,是开发中–低温砂岩型地热能的理想场所。本文的研究成果可以为东濮凹陷馆陶组的地热能勘探开发提供重要的热储信息。

The main heat reservoirs in Dongpu depression include Neogene Minghuazheng Formation, Paleo-gene Guantao Formation and Dongying Formation clastic rocks and Ordovician carbonate rocks. However, there is a lack of research on the temperature distribution of each heat reservoir, which restricts the evaluation of geothermal exploration and development in this depression. In this article, therefore, geothermal gradient and heat flow and thermal physical parameters of rock, on the basis of using one dimensional steady state heat conduction equation to calculate the guantao in the study area at the top and bottom of the heat storage temperature, the top surface temperature at 63˚C~106˚C, west slope belt, concave temperature are high and the central uplift belt, eastern time concave and LAN chat fault zone temperature are low;the temperature of the bottom surface is between 65˚C and 120˚C, and the heat storage temperature in the south is higher than that in the north. Guantao Formation has high sandstone content, high porosity and high permeability, which can form several types of heat reservoirs and develop medium-low temperature geothermal energy. It is an ideal place for developing medium-low temperature sandstone geothermal energy. The research results of this paper can provide important heat storage information for geothermal exploration and development of Guantao Formation in Dongpu depression.