Fluid Inclusion And Hydrocarbon Migration Period Of The Middle Elementary In The Yiyuan 1 Well And Its Adjacent Region

Combined with shale gas reservoirs SEM and sresidual gas analysis, analyses of fluid inclusions such as microscopic petrographic observation,microthermometry, microscopic furier transform infrared spectroscopy,microscopic raman spectroscopy, satisfied hydrocarbon chromatography mass spectrometry and carbon isotope were used to research the hydrocarbon migration periods of meso-proterozoic around Jiyuan 1 well. Studies show that pitch and oil were along cracks, corrosion holes and intercrystal pores in core and outdoors. Except Jiyuan 1 well, bore wells such as kuan 1 well, Jiqian 1 well Jiqian 2 well and Shuang 1 well had Significant hydrocarbon shows. Pingquan from the north to Lingyuan Kuancheng from the south of east-jibei depression, Longtangou xiamaling formation bituminous sandstone fossil reservoirs, shuangdong anticline tieling formation light oil fossil reservoirs, east shuangdong half anticline wumishan formation light oil fossil reservoirs, tashan anticline tieling formation light oil fossil reservoirs and lujiazhang anticline tieling formation light oil fossil reservoirs were founded.Hydrocarbon shows in bore wells and pitch and oil outdoors indicated that meso-proterozoic jibei depression used to have extensive hydrocarbon generation and accumulation history. The main achievements are listed as follow:1. Jibei region has wide pitch/oil seepage that shows the original nature of Mesoproterozoic oil and gas. In longitudinal direction, There were output in the meso-proterozoic Wumishan formation, Hongshuizhuang formation, Tieling formation and Xiamaling formation. Moreover, hydrocarbon was accumulated in Tieling formation. It’s because that Tieling formation reservoirs have Hongshuizhuang formation-Tieling formation-Xiamaling formation source-reservoir-cap assemblage which controls the oil and gas migration and accumulation.2. Lots of research on rock thin section microscopic petrography and hydrocarbon inclusions showed that Mesoproterozoic in the adjacent regions of ji yuan 1 well had multiphase hydrocarbon filling process. Longtan ditch Xiamaling formation ancient reservoir hydrocarbon filling temperature was 70 ~ 80 ℃; After diagenetic stage, the large-scale hydrocarbon accumulation temperature was 100 ~ 110 ℃. Tieling formation had two times hydrocarbon inclusions; the early accumulation of hydrocarbon temperature was 70 ~ 80 ℃, the late large-scale hydrocarbon accumulation temperature was 100 ~ 110 ℃. Wumishan formation had 3 times for the development of reservoir in light hydrocarbon inclusions; the small-scale hydrocarbon migration temperature of the first stage was 70 ~ 80 ℃; the light hydrocarbon filling temperature of the second stage was 100 ~ 110 ℃; the large-scale light hydrocarbon accumulation temperature of the third stage was 120 ~ 130 ℃.3. The Study showed that magmatic hydrothermal activity event at 922.00±19.44 Ma and 761.57±17.71 Ma had very adverse effects on the hydrocarbon source rock thermal evolution and the reservoir hydrocarbon migration and accumulation of ji yuan 1 well.4. The reservoir forming time of Ji Yuan 1 well and adjacent oil areas focuses on 150-180 Ma. And then, the key moment of hydrocarbon accumulation in this region is related to the peak period of paleotemperature caused by extremely active regional volcanic magma of Yanshanian.5. The result of microscopic laser Raman measurement shows that the main composition of reservoir gas in xiamaling formation, tieling formation and wumishan formation is CH4 while reservoir hydrothermal caused by mineral fluid fluorite inclusion contains a relatively high content of deep source CO2.6. The result of Micro-FTIR analysis shows that the reservoir of xiamaling formation, tieling formation and wumishan formation contains 2 hydrocarbon inclusion of great disparity in composition, most of the hydrocarbon inclusion is relatively rich in methyl, relatively short in carbon chain, compositional maturity is relatively high, belongs to light oil.7. The results of oil source study shows that the reservoirs’ oil and gas in Xiamaling formation, Tieling formation and Wumishan formation are mainly from organic-rich shale of Hongshuizhuang formation, other part of oil source are from shale of Tieling formation and Xiamaling formation. In addition, as a shale gas prospect area, organic-rich shale in Hongshuizhuang formation of Jibei depression has a good potential of development.