Organization
State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Research Institute of Exploration and Development, Zhongyuan Oilfield, SINOPEC, Puyang 457001, China
摘要
地热资源潜力评价需要精确的现今地温场进行约束。为了更好地明确东濮凹陷地热资源潜力，文中以已有地温场研究成果为基础，利用一维稳态热传导方程计算得到深度0~3 000 m和0~5 000 m的地温，获取了这2个深度段的地温梯度分布，并指出了东濮凹陷地热勘探有利区。研究结果表明：东濮凹陷深度0~3 000 m地温梯度为16.8~55.7 ℃/km，平均值为33.2 °C/km；深度0~5 000 m地温梯度为16.0~54.8 ℃/km，平均值为32.3 °C/km。同时，研究区具有隆起带地温梯度较高、凹陷区地温梯度相对较低的特征。东濮凹陷具有丰富的地热资源。其中：深度3 000 m处赋存了以中—低温型为主的地热资源；深度3 000~5 000 m主要赋存了中—高温型地热资源。文中还指出了3类地热勘探有利区：深度3 000 m处，位于中央隆起带的徐集断凸为Ⅰ类勘探有利区，桥口断凸和文留断凸评价为Ⅱ类勘探有利区；深度5 000 m处，地层温度普遍偏高，中央隆起带南部、西部斜坡带中部以及西部次凹区西南部为Ⅰ类勘探有利区，中央隆起带中部桥口断凸评价为Ⅲ类勘探有利区。
Abstract
The evaluation of geothermal resource potential needs to be constrained by the accurate current geothermal field. In order to better clarify the geothermal resource potential of Dongpu Sag, in this paper the one-dimensional steady-state heat conduction equation is used to calculate the temperatures of 0￣3,000 m and 0￣5,000 m based on the existing geothermal field research results, the geothermal gradient distribution of 0￣3,000 m and 0￣5,000 m are obtained, and which points out the favorable areas for geothermal exploration in Dongpu Sag. The results show that the geothermal gradient at 0￣3,000 m in the Dongpu Sag is 16.8￣55.7 ℃/km, with an average value of 33.2 ℃/km; the geothermal gradient of 0￣5,000 m is 16.0￣54.8 ℃/km, with an average value of 32.3 ℃/km. The study area is characterized by high geothermal gradient in the uplift area and relatively low in the sag area. Dongpu Sag is rich in geothermal resources, of which the geothermal resources dominated by medium￣low temperature exist at 3,000 m, and there are mainly medium￣high temperature geothermal resources in 3,000￣5,000 m. Three types of favorable areas for geothermal exploration are pointed out in the paper. At 3,000 m, the Xuji fault convexity located in the central uplift area is a typeⅠ exploration area, and the Qiaokou fault convexity and Wenliu fault convexity are evaluated as type Ⅱ exploration areas; at 5,000 m, the stratigraphic temperature is generally high, and the southern part of the central uplift area, the central of the western slope zone and the southwestern part of the western sub-concave area are typeⅠ exploration areas and the Qiaokou fault convexity in the middle of the central uplift area is evaluated as type Ⅲ exploration area.
论文详情