Stratum denudation thickness measurement method for superposition basin multi-phase difference upheaval region

Abstract

The invention discloses a measurement method, and particularly relates to a stratum denudation thickness measurement method for a superposition basin multi-phase difference upheaval region. The stratum denudation thickness measurement method disclosed by the invention comprises steps of finding out a stratum denudation original point A, wherein the biggest original point is A', determining a thinning rate of the stratum, calculating the original thickness Hi of the denudated segment, calculating the denudation thickness and performing denudation thickness compression and correction. On the basis of explaining the earthquake profile in detail, the stratum denudation thickness measurement method recognizes the unconformity, recovers the form, the growth characteristics and distribution trend of the stratum before the denudation according to the stratum characteristics like growth characteristics, extending trend, the breaking-cutting relation and the fold deformation relation characteristics of the non-denudated stratum interface near the unconformity interface, and calculates the distance between the stratum interface and the unconformity interface (denudation interface), wherein the distance is used as a thickness of the stratum which is denudation and is a denudation amount. The stratum denudation thickness measurement method is effective in recovering the denudation and high in precision.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for stratum denudation thickness in a multi-stage differential uplift area of ​​a superimposed basin. Background technique [0002] Stratum denudation is a common phenomenon in multi-stage sedimentary basins. Strong denudation has an important impact on the sedimentary history, structural evolution history, and thermal history of the entire basin. There is a close relationship among migration, accumulation and preservation conditions, so the recovery and determination of formation denudation is very important for the study of tectonic evolution history and oil and gas exploration. There are many methods at home and abroad for estimating the thickness of stratum denudation, which can be summed up in the following aspects ( figure 1 ): ① Sandstone porosity method (Ma Lixiang, 1991); ② Mudstone sonic transit time method (Katz&Magara, Zhenbingqinci); ③ Paleothermal method, in...

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Problems solved by technology

However, they are all limited by specific geological conditions, their application has great limitations, and there are different influencing factors (Table 1) (Li Wei, 1996; Liu Yiqun, 1997)

Since the porosity, compaction, paleogeotemperature, and Ro are all irreversible after the formation is buried, methods ①, ②, ③, and ④ are only suitable for applying new formations above the unconformity to undenuded formations below the unconformity. The pressure is less than that of the denuded formation above the unconformity exerted on the undenuded formation below the unconformity, and because drilling and testing data are often very limited, these methods cannot be used on a large scale

The use of the fifth method is limited because it is difficult to obtain the age value of the formation

The sixth method is only suitable for exploratory research with density data applications

The seventh method has certain applicability, but it cannot be used when the lateral thickness of the formation changes greatly and no complete formation exists.

However, when there is a lack of accurate Ro measured data and paleogeothermal data, its accuracy is poor

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