... d'une mesure est telle que l'erreur sur la ddtermination de la variation de G entre deux points n'excède pas 0,5 milligal. Les isogammes ont pu être tracés de milligal en milligal. Leur traed concorde t r ès bien avec les rèsultats obtenus antérieurement à l'aide de la balance de toi - sion d'Eotvos...

... Abstract Announcements in late 1965 and early 1966 of successful independent developments of two dissimilar borehole gravimeters having precisions close to 0.01 milligal began a new era of subsurface geophysical research. Depth-measurement precisions ranging from 3 to 6 cm permit overall...

... milligal Courtesy precision Section I - Paper 38 - PD 4 u. s. A. RECENT DEVELOPMENTS IN AIRBORNE MAGNETICS AND GRAVITY L. L. Nettleton * Abstract. Airborne magnetic surveys for minerals and for petroleum prospecting have covered some twelve mil l ion miles of flying in a t least 60 different countries...

... la Cordillère des Andes. La différence de l'anomalie, quand on traverse cette faille en direction Est-Ouest, est de 40 à 60 milligals. La strncture essentielle de la vallée centrale est décrite à l'aide d'un profil longitudinal qui parcourt 8" de latitude. On donne aussi dix profils transversaux...

... ABSTRACT No preview is available for this paper. gravity carson service carson aerogravity generation aerogravity system pp7 airborne gravity geology wavelength anomaly gumert milligal penfield correction reference line test range evaluation program evaluation reservoir...

... concept for the first time. Initial results are promising and we expect that with continued effort we should achieve sub-milliGal precision in AUV gravity surveys. Introduction: Gravity measurements have long played a unique role in the characterization of oil and gas reservoirs. Originally, the observed...

... is the inability to calculate useful densities at high depth resolution, usually taken as less than 30 feet. The culprit here is the division by Dg, which amplifies the effect of errors in Dg as Dz becomes small. For a station spacing of 10 feet and a Dg measurement uncertainty of 0.0071 milliGals (mGals...

..., of surface in top of salt domes show that a lso bu means 06 the gravimeter the size and local positi Upstream Oil & Gas mit dem den Jahren gravimeter der mittlere fehler Schleusener werden milligal mgal der messungen mit dem thyssen-gravimeter messungen mit dem entwicklung der messungen...

... of the aircraft. These can be of the order of tens or even hundreds of thousands of milligals. Even if there is a very slight deviation of the gravity sensor from the vertical, the horizontal accelerations will influence the gravity measurements. Vertical accelerations of the aircraft combine directly...

... telemetry. Sediment motions are measured with a three-axes array of force-balanced accelaro- meters having a dynamic range of 50 milligals to 500 gals. Accelerometer outputs are digitized at a rate sufficient to reprod.uce frequencies up to 20 Hz. Data are stored in a one-million bit capacity solid-state...

.... As an aid to the discussion two bathymetric charts, also on scale 1: 10,000,000, have been com- piled from the latest available data. Résumé La communication présente deux cartes d'isogam- mes à l'échelle 1: 10.000.000, avec htervalle d'iso- gammes de 25 milligals. L'une représente la Mer des Caraïbes...

..., des soins s éciaux ont été nécessaires dans les campagnes de détail pour que les anomalies locales qui n'excèdent pas un très petit nombre de milligals soient suffisamment claires. Les principes d'organisation et d'exécution des recherche Upstream Oil & Gas regional anomaly accuracy...

... in field- lion x = û simplifies to work and which allow g-determinations to be made with (3") Q = -ATZ, with a mean ernor, which is, at the present time, about A" = h - k. O5 milligal. 4 s such instruments now are being used for A" is tha total control in the zero position, oil prospecting by the company...

.... Mean square averages of these residuals are as follows : 2.4 gmlcc Bouguer : 2.630 milligals Single layer, variable density Bouguer lreqression) : 2.278 milligals Double layer, variable density Bouguer (Nettleton) : 2.159 milligals Average combined densities (weighted average between (II and oz...

... Figure 4. Elevation contour map over part of the southern coastal region of South Africa. Contour interval 200 metres. Figure 5. Isostatic effect over southern coast of South Africa. Contour interval 20 milligals. Airy- Heiskanen hypothesis, 30 km compensation depth, averag crustal density of 2870 kg.m...

... salt gap between inline coordinates 350,000 and 450,000 feet. Figure 2: Bouguer gravity Wiener depth sliced 0 to 20,000 feet below sea level. Red = anomalies > 2.0 milligals, purple = anomalies < -2.0 milligals, and light blue = small anomalies 0.1 milligals). (EDCON gravity data) Modeling Procedure...