Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (1): 35-47.DOI: 10.13745/j.esf.2020.1.5

Previous Articles     Next Articles

Screening of hot dry rock in the south-central part of the Bohai Bay Basin

ZHANG Ying,FENG Jianyun,LUO Jun,HE Zhiliang,WU Xiaoling   

  1. 1. Petroleum Exploration and Production Research Institute,China Petroleum and Chemical Corporation, Beijing 100083, China
    2. China Petroleum and Chemical Corporation, Beijing 100728, China
  • Received:2019-09-02 Revised:2019-09-30 Online:2020-01-20 Published:2020-01-20

Abstract:

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 m deep drilling wells ranged between 3.073.32 and 2.963.27 ℃/100 m, respectively; and temperature reached 180 ℃ at 43096261 m buried 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MesozoicLower 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 30005000 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.

Key words:  south-central part, Bohai Bay Basin, hot dry rock, deep thermal reservoir, geothermal gradient

CLC Number: