摘要
渤海湾盆地是我国华北油气开发的主战场,多年的油气勘探开发积累了大量钻井、测录井及测温数据。通过对区内深钻井测温数据的分析研究,发现中南部的冀中坳陷、黄骅坳陷、临清坳陷和济阳坳陷是干热岩地热资源的主要富集区,温度≥180℃的热储主要发育在基岩潜山或斜坡区,埋深适宜,温度较高,有一定的天然孔渗条件。4个主要坳陷区4000m以深钻井平均地温梯度范围为3.07~3.32℃/100m,5000m以深钻井平均地温梯度范围为2.96~3.27℃/100m,埋深越大,地温梯度越低。坳陷区埋深在4309~6261m时相继达到180℃温度,为干热岩目标埋深范围。不同坳陷、区块和井区达到180℃干热岩温度界限的深度相差较大。下古生界、中元古界和太古宇三套热储是渤海湾盆地中南部最具开发利用潜力的干热岩热储类型。冀中坳陷主要发育奥陶系灰岩、寒武系白云岩和中元古界白云岩热储,黄骅坳陷以奥陶系灰岩热储为主,济阳坳陷发育寒武系-奥陶系灰岩和太古宇变质岩热储,临清坳陷主要为奥陶系灰岩热储。坳陷区的凹中和凹边凸起区,顶面埋深3000~5000m的前中生界潜山是主要的勘探方向,冀中坳陷河西务、长洋淀等潜山,黄骅坳陷南大港、千米桥等潜山,济阳坳陷桩西孤北等潜山,临清坳陷马场、文留等潜山是干热岩勘探开发有利区。干热岩勘探可与深层油气勘探开发相结合,进行不同类型资源的兼探和综合开发利用。
The Bohai Bay Basin is the main battleground of oil and gas exploration in North China.A large amount of drilling,logging and temperature data have been collected through oil and gas exploration and development.Based on the analysis of temperature data,we found significant heat anomalies in the depression zone of this area,indicating potential for hot dry rock resource exploitation in the Jizhong,Huanghua,Linqing and Jiyang depressions.In these areas,carbonate and metamorphic rocks,such as Archean gneiss,mainly developed in the buried hill or uplift area in Lower Palaeozoic and Mesoproterozoic reservoirs,with proper burial depth,high temperature(≥180℃)and certain natural pore and permeability conditions.According to the calculations of geothermal gradient in the four depressions,the average geothermal gradient in 4000 and 5000 mdeep drilling wells ranged between 3.07-3.32 and 2.96-3.27℃/100 m,respectively;and temperature reached 180℃at 4309-6261 mburied depth,which is the range of target buried depth of hot dry rock.The depth of hot dry rocks reaching 180℃varied greatly in different depressions.Three sets of pre-Mesozoic-Lower Paleozoic,Proterozoic and Archean buried hill thermal reservoirs are the most promising types of hot dry rock thermal reservoirs.For instance,we found buried Ordovician limestone and Cambrian and Middle Proterozoic dolomite in the Jizhong depression,mainly buried Ordovician limestone in the Huanghua depression,buried Cambrian-Ordovician limestone and Archean metamorphic rock in the Jiyang depression,and buried Ordovician limestone in the Linqing depression.The main exploration target is the concave and convex areas with buried depths of 3000-5000 m.Buried hills,such as Hexiwu and Changyangdian in the Jizhong depression,Nandagang and Qianmiqiao in the Huanghua depression,Zhuangxi and Gubei in the Jiyang depression,Machang and Wenliu in the Linqing depression,are favorable for the exploration and development of hot dry rocks as well as deep oil and gas.
作者
张英
冯建赟
罗军
何治亮
武晓玲
ZHANG Ying;FENG Jianyun;LUO Jun;HE Zhiliang;WU Xiaoling(Petroleum Exploration and Production Research Institute,China Petroleum and Chemical Corporation,Beijing 100083,China;China Petroleum and Chemical Corporation,Beijing 100728,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2020年第1期35-47,共13页
Earth Science Frontiers
基金
国家重点研发计划项目(2019YFC0604903)
中国工程院咨询研究项目(2019-XZ-35-04)。
关键词
渤海湾盆地中南部
干热岩
深部热储
地温梯度
south-central part,Bohai Bay Basin
hot dry rock
deep thermal reservoir
geothermal gradient
