In many applications of highly structured statistical models the likelihood function is intractable; in particular, finding the normalisation constant of the distribution can be demanding. One way to sidestep this problem is to to adopt composite likelihood methods, such as the pseudo-likelihood approach. In this paper we display composite likelihood as a special case of a general estimation te...

1830. [2] Milkereit B., et al. (2006) this volume. [3] Plado J., et al (2002) Meteoritics & Planetary Science, 35, 723-732. [4] Brown M. et al. (2006) this volume. Acknowledgement: Drilling was funded by ICDP, the U.S. NSF, the Austrian FWF, the Canadian NSERC, and the Austrian Academy of Sciences. Drilling operations were performed by DOSECC. Local help by the Geological Survey Department (Acc...

this study aims to identify favorable oil–gas reservoir facies in the chishan group of the wubao fault zone (gaoyou sag, subei basin, china) using the methods of outcrops and cores observation, granularity analysis, scanning electron microscope, log data, etc. the results suggest that the chishan group in the studied area mainly develops desert sedimentary system, and contains five kinds of fac...

The formation resistivity factor evaluation of brine-filled reservoir rock is an essential part of electrical resistivity log interpretation in petroleum exploration. Empirical relations such as Archie’s law are widely employed to model the relationship between the formation resistivity factor and porosity. Historically, the Archie cementation exponent has been obtained from experimental labora...

Abstract This paper presents a well test interpretation methodology using characteristic points and lines found on the pressure derivative versus time log–log plot for characterization of finite-conductivity fractured vertical hydrocarbon in double-porosity (heterogeneous) formation considering new practical analytical Laplacian model which require less computational have more accuracy than sem...

The use of sonic log data to analyse overpressure in the Cooper Basin, South Australia is complicated by the occurrence of Tertiary uplift in the basin. Uplift and overpressure are both associated with anomalous porosity/depth relationships: the former being witnessed by overcompaction and the later by undercompaction. Hence uplift may mask overpressure effects on log data. A normal compaction ...

We prove the termination of flips for pseudo-effective NQC log canonical generalized pairs dimension 4. As main ingredients, we verify 3-dimensional pairs, and show that which admit weak Zariski decompositions follows from in lower dimensions.

Evaluating any subsurface CO2 storage site comprises the reservoir, seal, and overburden investigation to mitigate injection storage-related complications. The Upper-Middle Jurassic Sognefjord, Fensfjord, Krossfjord formation sandstones are potential reservoirs at Smeaheia area, northern North Sea. area is located east of Troll oil gas field. Upper organic-rich Heather Draupne Formation shales ...

We discuss petrophysical analysis of wireline logs, methods for formation evaluation and issues in evaluating tight sandstone formations. The main concerns of log interpretation in tight gas sandstones include porosity interpretation, understanding the effect of clay on the log responses, accurate computation of water saturation, and permeability determination (Kukal et al., 1985). Moreover, va...

Carbonate reservoirs rock typing plays a pivotal role in the construction of reservoir static models and volumetric calculations. The procedure for rock type determination starts with the determination of depositional and diagenetic rock types through petrographic studies of the thin sections prepared from core plugs and cuttings. In the second step of rock typing study, electrofacies are deter...