Physical Properties of Hydrocarbon Source Reservoir in the Lucaogou Formation in Junggar Basin (China) and Its Influence on Adsorption Ability and Surface Free Energy

A physical property of a shale gas reservoir affects content, then restricts the resource potential. In this paper, lithofacies and spatial distribution southern margin Junggar Basin in Xinjiang Province are identified occurrence strata, properties studied. Based on adsorption potential theory, surface free energy all sample is discussed. The conclusions as follows. (1) All samples can be divided into five lithological phases. For example, black oil shale/shale (lithology) phase gray-black-gray/dolomite mudstone most developed; compared with middle lower sections, vertical development continuity upper hydrocarbon source rock better. Lithology section mainly composed mixed marlstone dolomite interlayer. From horizontal view section, overall trend gradually thickening from west to east north south. (2) Semi-deep lake-phase developed, indicating decreasing thickness sedimentary center surrounding strata. (3) Sedimentary period Lucaogou Formation deep water area lake basin; then, TOC content affected by environment. As depth increases, will increase, which results highest area. specific roughly positively correlated porosity, clay mineral percentage illite/montmorillonite interlayer ratio negatively content. (4) During process, decreases an increase equilibrium pressure, space increases pressure. Maximum were 0.20~0.25 cm3·g−1; its value larger than maximum other coal (0.025~0.20 cm3·g−1). same space, corresponding much that samples. reason porosity permeability relatively larger, leading better properties.