Identification of the Complex Lithology of Mixed Rock

doi:10.11885/j.issn.1674-5086.2019.04.08.01

Abstract

Abstract: The Permian Lucaogou Formation in the Jimsar Sag is a set of terrigenous clastic and carbonate mineral mixed rock layers with complex and diverse mineral types. Currently, controversy still exists surrounding the naming conventions for the lithology of the Lucaogou Formation, which has greatly affected the efficiency of lithology identification at drilling sites. In this paper, X-ray fluorescence (XRF) and X-ray diffraction (XRD) were applied to the comprehensive analysis of the relationship between rock mineral composition and elemental content. By adopting the element cross-plot method, we established six types of lithological identification plots, including feldspar lithic sandstone, fine sandstone, mudstone, mudstone dolomite, sandy dolomite, and dolomitic sandstone. Comparative analysis revealed that the coincidence rate can reach 80%. This provides a good method for in situ lithology and sweet-spot identification of tight oil mixed rock, which could effectively guide lithology identification and geosteering of horizontal wells on site.

Key words: tight oil, mixed rock, Jimsar, XRF, XRD

CLC Number:

TE122

CHEN Gongyang, WANG Pengyu, GAO Yang, ZHANG Fang, YIN Senlin. Identification of the Complex Lithology of Mixed Rock[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 1-14.

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