Geological stuck layer method in gypsum-salt formation

Abstract

The invention discloses a gypsiferous salt stratum geological layering method. The gypsiferous salt stratum geological layering method comprises the steps that seismic data of a survey region are obtained, precisely processed and explained, and the top, the bottom and the thickness of a gypsiferous salt stratum are predicted; inversion prediction is carried out on an internal lithological character of the gypsiferous salt stratum; logging is tracked and analyzed, and the gypsiferous salt stratum is layered by combination of auxiliary judgment of logging parameters. The precise processing and explaining of seismic data, lithological character inversion and logging tracking and analysis are combined, then tracking, explaining and analysis while drilling are flexibly applied to the logging layering process, and then the logging parameters are compared and analyzed, so that the gypsiferous salt stratum is layered better.

Description

technical field [0001] The invention relates to a mud logging real-time layer-stuck method for oil drilling exploration, in particular to a layer-stuck method for special formation gypsum-salt formations. Background technique [0002] The Kuqa Depression is a key area for natural gas exploration in the piedmont structural belt of the Tarim Basin. The Kuqa Depression is seriously affected by regional faults, and has a large stratum dip angle and obvious features of high and steep structures. The traps of the main target layers are generally buried deep, and thick gypsum-salt layers are developed on them. The extremely thick gypsum-salt layer is difficult to accurately grasp, which brings great difficulties to early earthquake prediction and later exploration and development. [0003] The distribution of the gypsum-salt layer in the Kuqa Depression is not only affected by the original depositional environment, but also under the strong structural compression in the later per...

AI Technical Summary

Problems solved by technology

At present, the conventional mud logging layer jamming can be stuck in the gypsum-salt formation to a certain extent, but it cannot accurately predict the lithology of the gypsum-salt body, invert and predict the lithology of the gypsum-salt body. The thickness cannot be accurately predicted, especially under the current new drilling technology and new drilling fluid system conditions, and lithology identification is also difficult. Therefore, it is difficult to accurately predict special gypsum-salt formations by conventional mud logging. and requirements for accurate card layers