The reservoir conditions in southeast Sichuan Basin：A study on temperature logging curve of Dingshan 1
Gong Hao1 Zhu Chuanqing2 Xu Ming2 Guo Tonglou3 Yuan Yusong4 Lu Qingzhi5 Hu Shengbiao2
1.Tianjin Geoengineering Investigation Institute|Tianjin 300191； |2.Institute of Geology and Geophysics|Chinese Academy of Sciences|Beijing 100029； |3.Exploration Department of South Company of Prospecting|SINOPEC|Chengdu 610041； | 4.Exploration and Production Research Institute|SINOPEC|Beijing 100083； |5.Schlumberger(China)| Beijing 100016
The temperature logging curve of Dingshan 1 shows that as the depth goes to higher the temperature rising，the value is 25 ℃ at the top，and 1075 ℃ at the bottom. The temperature logging curve has an “arch” at the depth of 1 000～3 000 m. The observational temperature gradient section can be divided to 3 parts：its value of the Permian strata is 2394 ℃/km，and its value of Silurian and Ordovician is 3727 ℃/km，while the temperature gradient is very low，the value is 1665 ℃/km. According to the characteristic of geothermal gradient section and its relationships and pertinences with the thermal conductivities and lithology of the stratum，we reach a conclusion that the vertical motion of subsurface fluid caused the perturbation of the temperature curve. This conclusion is adopted to deduce the strata of Cambrian have high porosity and permeability，while the strata of SilurianOrdovician have a high sealing capacity，and this assembly of strata is propitious to the hydrocarbons accumulation. It may be an indication of that there is a potential of the Lower Assemblage in southeast Sichuan Basin.