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| Mutual relation between organic matter types and pores with petrological evidence of radiolarian siliceous shale in Wufeng-Longmaxi Formation, Sichuan Basin |
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ZHOU Xiaofeng1,2, GUO Wei3, LI Xizhe3, ZHANG Xiaowei3, LIANG Pingping3, YU Junmin1
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(1.College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China;2.State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;3. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)
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| Abstract: |
| By means of argon ion polishing and scanning electron microscope technologies, the mutual relations between organic matter types and pores in radiolarian siliceous shale of Wufeng Formation-Longmaxi Formation in Sichuan Basin were studied. The results show that three types of overmature organic matter and organic matter-hosted pores clearly record the diagenetic evolution of sedimentary organic matter-clay complexes. During the solidification stage of sediment, the sedimentary organic matter-clay complexes were transformed into kerogen-clay complexes. At the low maturity stage, kerogen-clay complexes were converted to pre-oil asphalt-clay complexes and migrated pre-oil asphalt. In the mature stage, the pre-oil asphalt was degraded to produce oil, and pre-oil asphalt-clay complexes were transformed into solid asphalt-clay complexes and migrated pre-oil asphalt turned into solid asphalt accordingly. In the process of high to overmature, the organic matter was cracked to produce wet and dry gas with solid asphalt-clay complexes evolving into pyrobitumen-clay complexes and migrated solid asphalt and oil turning into pyrobitumen. Pyrobitumen-clay complexes and pyrobitumen from migrated solid asphalt have pores, and they are Type Ⅰ organic matter and Type Ⅱ organic matter in turn. Pyrobitumen from oil has no pore and becomes Type Ⅲ organic matter. It is suggested that the petrological characteristics of radiolarian siliceous shale to study the mutual relation between organic matter types and pores of shale oil and gas reservoirs and the organic matter-clay complexes should be regarded as an important occurrence of sedimentary organic matter to distinguish in-situ organic matter versus migrating organic matter. |
| Key words: radiolarian siliceous shale petrological characteristics type of organic matter organic matter-hosted pores Wufeng Formation-Longmaxi Formation Sichuan Basin |
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