Short-refraction investigation method for undulating surface of terrain high-variability area in ultra-thick loess highland

Abstract

The invention provides a short-refraction investigation method for the undulating surface of the terrain high-variability area in the ultra-thick loess highland. The short-refraction investigation method for the undulating surface of the terrain high-variability area in the ultra-thick loess highland comprises the steps that 1, a short-refraction observing system is used, an encounter observing system is used, and shot points are laid in a certain receiving arrangement mode; 2, wave detectors are embedded, and coordinates of each receiving point and each shot point are actually measured according to channel distances arranged in a short-refraction mode; 3, pit cannon excitation is adopted, and selection of the well depth and the explosive quantity conforms to the safety standard; 4, short refraction is explained, refraction tomographic inversion is carried out, and an exquisite near-surface structural model is set up. According to the short-refraction investigation method for the undulating surface of the terrain high-variability area in the ultra-thick loess highland, exquisite near-surface investigation can be carried out on the high-variability area in the ultra-thick loess highland, the defect that near-surface information can not be extracted accurately and easily in similar areas is made up, and the method has high application and popularization value in the whole loess highland.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a small refraction investigation method for undulating surface in a region with severe topographic changes in a huge thick loess plateau. Background technique [0002] my country is the country with the widest distribution of loess in the world. The loess plateau in the middle and lower reaches of the Yellow River in northern Shaanxi, central and eastern Gansu, southern Ningxia and Shanxi covers an area of ​​about 2.7×105km 2 , accounting for about 72.4% of the loess area in my country, developing the most typical loess landform in the world. There are three blocks in Shengli Oilfield involving this loess plateau area, namely most of Liupanshan Basin, Zhongwei Basin and part of Ciyaobao, with an area of ​​nearly 10,000 km 2 . The total block area of ​​Shengli Oilfield in Shandong is only 61,000 km 2 , the loess plateau area in the west of Shengli can be described ...

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Problems solved by technology

In the past, the conventional micro-logging was difficult to drill to the predetermined depth. The small refraction had limited application effect in the loess plateau area with severe undulations, and the error was large. The ground geological survey could not accurately control the entire exploration area in the thick loess plateau area, and could not establish a fine The near-surface model cannot provide reliable surface data for subsequent excitation and static correction, thus restricting the exploration progress of the loess plateau

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