ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00568.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The observable concentration of the major deep gas accumulation areas in the NW German Basin is the result of focused secondary migration. Gas generated in several effective depocenters (regional structural lows) from Late Carboniferous source beds migrated into adjacent regional structural highs. The preferred migration paths are qualitatively predictable on the basis of present basin geometry. Optimal conditions for gas accumulations exist where the presently trapping regional highs have also been sites of favorable reservoir development. On‐going and future deep‐gas exploration efforts in the basin can be regarded as quite hope

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00569.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

A petrographical investigation of the sandstones of the Brent Group (Middle Jurassic) from the Murchison field has produced evidence for the existence of two transgressive events within the sequence, one occurring immediately above the Etive Fm., the other within the upper part of the Ness Fm. These transgressions have not been previously recorded in Murchison and their discovery demands that some modification be made to the existing depositional model for the Brent Group of this area. A volcanic ash horizon has been found in a similar stratigraphic position to that recorded from Statfjord, and if this, and the two transgressive horizons noted above, are of more than local extent they could prove to be useful stratigraphic markers.Although the diagenesis of the Brent Group sandstones in Murchison differs little from that recorded elsewhere in the Brent province, the interpretation of the timing of the development of certain phases differs somewhat from those of other authors. In particular, kaolinite development appears to have taken place soon after burial in response to periods of emergence and weathering during Brent Group deposition, rather than through groundwater circulation during the Kimmerian tectonic phase.

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00570.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Twenty‐two “oil shale” samples from north Jordan have been investigated. They are in fact all bituminous limestones, of ages ranging from Uppermost Cretaceous to Paleocene. Major elements, organic matter and trace elements, were determined, together with aspects of mineralogy and petrography. Although macrofossils are rare, trace fossils were encountered. These rocks are postulated to be normal limestones deposited in an oxygenated shallow marine environment. The H2S/O2interface coincided or lay just below the water/sediment interface. The organic matter is indigenous and not related to migratin

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00571.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The Cambay Basin in the NW part of the Indian Peninsula is a commercial petroleum producer from Tertiary sediments resting on the basic lava flows known as Deccan Traps. Cretaceous sediments which underlie the Deccan Traps are exposed in the eastern and western margins of the basin and are also encountered in the subsurface. The paleogeographic reconstruction of the Cambay Basin suggests that the northern part, possessing a thin cover of Cretaceous sediments, has meagre petroleum prospects. However, the southern part of the basin, where more than 1,000 m of Cretaceous sediments were deposited by two independent drainage systems, may be more lucrative. Suitable facies for generation and accumulation of petroleum are expected in this part of the basin.

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00572.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The Mozambique‐Madagascar geosyncline may rank above congeneric borderland down warps along the western Indian Ocean in its hydrocarbon exploration quality. On the Mozambique flank, gas in significant quantities has been produced on test. On the Madagascar flank, bitumen in equally significant quantities has been outlined. Exploration of the geosyncline as a whole has included the drilling of more than 30 wells on the Mozambique flank, and more than 40 wells on the Madagascar flank. Of this total of more than 70 wells, 15 exceed 4,000 m in depth. Objectives almost untouched by the drill are the Karroo strata below basalt on the Mozambique flank, Karroo strata below marine Jurassic onlap on the Madagascar flank, and Karroo strata that this writer believes should exist in continental and mixed facies at the center (below deep waters of the present Mozambique Channel). Considerable depth of burial of all these Karroo objectives should enhance the maturation of their original organic matter to the hydrocarbon stage, even though that matter was initially vegetal and palynomorphic. Post‐Karroo objectives may be limited to the geosynclinal flanks, because pelagic facies may have dominated the center throughout post‐Karroo time. Limitation to the flanks, however, does not adversely affect depth of burial in many areas. Post‐Karroo strata, in fact, may rival their Karroo predecessors, especially considering the presence of marine intercalations. Principal exploration parameters such as sedimentary volume, source rock, reservoirs, and present density of drilling, are favorable or good. They suggest that the Mozambique‐Madagascar geosyncline is a prospect worthy of much additional deep drilling to find major reserves of

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00573.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The paper deals with the history of the development of methods used for the prognostic evaluation of hydrocarbon resources in the USSR, their modern classification, and the calculation techniques involved. Ultimate resources are divided into discovered reserves and predicted resources. The latter are divided into D1and D2sub‐groups, according to the presence or absence of production from the formation under evaluation. Prognostic resources include identified and unidentified components. The modern system of forecasting provides a review of adequate information and the determination of requirements for: (i) the quality of prediction; (ii) the creation of theoretical models for oil and gas generation and accumulation processes in the region under evaluation; (iii) the determination of quantitative functional relations as a forecasting tool; (iv) resources estimation using different models; and (v) the correlation of the results obtained and the differentiation of the resources in terms of the efficiency of capital investment required for their developmen

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00574.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

It is believed that the sediments of Lake Bosumtwi in Ghana are underlain by a body of fallback breccia and a highly fractured basement uplift which could form a significant trap. The lake sediments wouldprovide a rich source of biogenicgas and also seal the reservoir. Reserves of 7 cu km (250 billion cubic feet) of gas are estimated.

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00575.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00576.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1983.tb00577.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY