Dividing method for element phases of shale and evaluation method for element phases

Abstract

The invention provides a dividing method for element phases of a shale section from a five-peak group to a Longmaxi group and a evaluation method for the element phases. The dividing method comprisesthe steps: screening out characteristic elements from shale stratum data in the same block; establishing an element phase division standard according to the relationship between the characteristic elements and the deposition environment; and according to the element phase division standard, carrying out element phase division on each layer section from the five-peak group to the Longmaxi group. The evaluation method can comprise the following steps: carrying out element phase division on each section from the five-peak group to the Longmaxi group by adopting the method, and evaluating reservoir parameters; and according to the evaluation of the reservoir parameters, further realizing the evaluation of the divided element phases. The method has the beneficial effects that the distribution condition of the favorable reservoir can be quickly judged, the quick identification and evaluation work of the shale gas high-quality reservoir can be realized, and the method can play a guiding rolein exploration and development work such as sedimentary paleo-landform recovery, favorable zone optimization, reservoir fracturing transformation and the like.

Description

technical field [0001] The invention relates to the field of geology, in particular to a method for dividing element phases of shale sections from Wufeng Formation to Longmaxi Formation, and an evaluation method for element phases. Background technique [0002] Shale gas is a kind of unconventional natural gas that occurs in organic-rich shale-dominated reservoir rock series. Different depositional environments have different deposition rates and paleoproductivity, which control the mineral composition of source rocks, so depositional environments are one of the main factors controlling the development of shale gas reservoirs. The identification of depositional environment is often based on the sedimentary signs such as rock type and composition, sedimentary structure, and biological fossils preserved in sedimentary rocks. The content of elements is different, and the composition of rock minerals is different, which to a certain extent reflects the difference in depositiona...

AI Technical Summary

Problems solved by technology

At present, although there have been related studies on the relationship between the elemental geochemical characteristics of shale gas reservoirs and the depositional environment at home and abroad, no specific quantitative standards have been formed, and no clear instructions have been given for the exploration and development of shale gas. effect

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