We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
川南一黔中地区下寒武统页岩气富集条件探讨.
- Authors
顾志翔; 何幼斌; 彭勇民; 饶松; 杜伟; 张灿
- Abstract
According to the Lower Cambrian black shale outcrop observation and drilling core description in southern Sichuan-central Guizhou, based on the method of argon ion polishing-scanning electron microscopy, geochemical isothermal adsorption method and geophysical data, this paper discussed the conditions of shale gas enrichment. In the study area the sedimentary facies of the organic-rich shale is deep water shelf facies and middle shelf facies; the organic carbon content is above 2% in general, and the maturity is 1.32%-4.78%, averaging at 2.85%. Type I kerogen is the dominant organic materials, and the reservoir types are mainly micron-nano porosity, with developed fractures. The shale property statistics show that porosity ranges between 0.24%-11.9% and permeability ranges between (0.000 087-0.535)×10-3μm2, and the average content of gas capacity from isothermal adsorption test is 2.74m3/t. The content of gas of Huangye-1 well from field analysis is between 0.16m3/t to 0.99m3/t with an average of 0.52m3/t. The content of gas of Jinshi-1 well from field analysis is between 1.51-2.41m3/t, with an average of 1.8m3/t. The research shows that shale in the Lower Cambrian in Sichuan Basin has good experience for shale gas accumulation of long shallow burial-long uplift-rapid deep subsidence-rapid uplift of the burial history and thermal evolution history and the structure is relatively stable, so it results in good shale gas preservation conditions, but outside the area of the basin,the hydrocarbon generation and expulsion, which experienced many times, also suffered from the transformation of tectonic movement, and the preservation conditions of shale gas reservoirs were destroyed in different degrees. Therefore, the superior material basis, preservation condition are the main controlling factors for shale gas enrichment. The exploration area should go to the Sichuan Basin, the constituency to find conducive to shale gas reservoirs of the burial history and thermal history, and at the same time we should take the principle which is “high to find low, strong to find weak, good to find thick”.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p642
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.02.008