LDP-1 Litho Density Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

Small diameter and lightweight instrument, suitable for use in small borehole drilling.
Spectrum stabilization is achieved by real-time temperature compensation and monitoring the count rate of the high energy peak symmetry channel, and the analysis is achieved by linear matrix least squares method
The method of simultaneous measurement of long and short source distance detectors can compensate for unfavorable factors such as mud cake.

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Description

FAQ

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Description

Abstract

LDP-1 Litho Density Probe is an improvement and extension of density logging. In addition to recording the density of rocks, it also measures the photoelectric absorption cross-section index Pe of the formation, which is related to the lithology. During logging, the instrument records the higher energy part and the lower energy part of the scattered y-ray respectively. The intensity of the scattered y-ray in the high energy part depends on the density; the low energy part is mainly related to the lithology and also to the density, and pe can be obtained after processing.

Applicable Conditions

● Case

● Bare hole fill with water or mud

● Bare Dry hole

Applications

● Evaluation of complex rocky oil -containing gas layers

● Identification of rocky and clay type

● Quantitative calculation of the original strata density

● Research phase change and deposition environment

● Measuring strata porosity degree

Features

● Small diameter and lightweight instrument, suitable for use in small borehole drilling.

● Spectrum stabilization is achieved by real-time temperature compensation and monitoring the count rate of the high energy peak symmetry channel, and the analysis is achieved by linear matrix least squares method

● The method of simultaneous measurement of long and short source distance detectors can compensate for unfavorable factors such as mud cake.

Specifications

Natural gamma detector	NAL crystal+photoelectric pipe
Radiation source	CS137, 3700MBq
Quantitative parameters and range	Natural Gamma: 1 ~ 32768cps, Sccuracy: 5%F.S; Density 1.3 ~ 3.0g/cm3, Accuracy: ± 0.025g/cm3; Pe: 0 ~ 20, Pe: ± 0.2B/e (1.3 ~ 6B/e)
Signal output	Bipolar encoding

FAQ

In gravity exploration (SI), what is the unit of gravity? How to convert gravity units between SI and CGS?

What are gravitational field and gravitational potential?

What is the normal gravity field of the earth? What are the rules for the change of the normal gravity field with latitude and altitude?

① The normal gravity field of the earth: Assuming that the earth is a rotating ellipsoid (reference plane), the surface is glossy, the internal density is uniform, or it is distributed in concentric layers, the density of each layer is uniform, and the deviation of the shape of the ellipsoid from the geoid is very small, then the gravity field generated by the earth is the normal gravity field.
② The normal gravity value is only related to the latitude, the smallest at the equator and the largest at the poles, with a difference of about 50,000 g.u.; the rate of change of the normal gravity value with latitude is the largest at 45° latitude, and zero at the equator and the poles; the normal gravity value decreases with increasing altitude, and its rate of change is -3.086 g.u.. The main feature of the long-term change is the "westward drift" of the geomagnetic elements, both the dipole field and the non-dipole field drift westward, and have a global nature.

What is the relationship between gravitational field strength and gravitational acceleration?

What is gravity exploration?