ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00133.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

The mid‐Cretaceous Mardin Group is the main producing reservoir interval in the oilfields of SE Turkey. During the mid‐Cretaceous, deposition of lime mudstones and bioclastic limestones took place on a carbonate platform. Repeated tectonic uplift occurred locally throughout this time, during the early stages of the closure of the southern Neotethys. The interplay of eustatic transgressions and regressions with local tectonic uplift controlled deposition and diagenesis, the latter including major secondary porosity development during dolomitization and karstification. Minor shortening and uplift in the Late Cretaceous and Palaeogene created structural traps and may also have enhanced fracture porosity. Major thin‐skinned thrust tectonics breached many reservoirs in the late Miocene. Surface anticlines which formed during the Miocene have attracted most of the exploration drilling to date, but may be the sites of the most intense breaching of the reservoirs. The distribution of the best potential reservoirs is not necessarily linked to the positions of Miocene antic

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00134.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Clastic sediments of Albian age are widely distributed throughout the Arabian Gulf, varying in thickness from less than 78 m to more than 390 m. The transition from sandstones in the northern part of the western Arabian Gulf (South Iraq, Kuwait and eastern Saudi Arabia) to shales in the SW and southern part (Qatar, United Arab Emirates and Oman) shows vertical and lateral variations. A complex nomenclature has been applied to different fades across the region, and the sediments may have several formation and member names (such as Nahr Umr and Burgan Formations, or Khafji and Safaniya Members).Clastic sediments of Albian age provide hydrocarbon source rocks, reservoirs and seals. Major reservoirs occur in sandstones to the north, and have a limited reservoir potential in offshore Qatar. Distal shales are a major seal in offshore Qatar, the United Arab Emirates and Oman. Local source‐rock potential exists in the northern part of the Arabian Gulf and in the extreme SE of Saudi Arabia (in the Rub Al Khali Basin

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00135.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

The evolution of non‐compressional sedimentary basins can be modelled in many ways. A number of existing schemes rely on assuming mathematical relationships between such geodynamical parameters as subsidence and heating of a basin and the amount of presumably causative tectonic extension. The usual objective is to determine precisely the geological history of a sedimentary basin, and to predict the unknown parameters.Models inevitably simplify complex natural systems. Many models of basin formation rely on specific assumptions about the dynamics of the crust (pure‐shear or simple‐shear deformation, the Moho as a passive marker, uniform extension, absence of older weakness zones, certain metamorphic reactions at depth, etc.) and about the structure and geological history of the basin (purely conductive heat transfer, existence of an underlying rift, etc.). Such assumptions cannot always be tested in poorly‐studied regions, and in some cases they contradict the available geological information. For simplification to be valid, the, geological system has to be understood in some detail before model parameters are chosen. Misleading results may be obtained if an inappropriate model is applied, or if its parameters are ill‐constrained.Many different geodynamical processes may contribute to basin evolution. In the North Sea region, for example, both mantle‐plume activity and mobility of lower‐crustal material are proposed to have occurred in Mesozoic and Cenozoic times. The Jurassic plume may have been influenced in part by ancient lithospheric structure.The preferred method in basin analysis is the multidisciplinary approach based on a broad range of data, of which quantitative modelling may or may not be a part. In the integrated basin analysis, geological information is used to constrain the interpretation of gravity, magnetic and seismic data, thus revealing the structure of the basin and helping infer its geological history. Combined with geochemical data, these results are a useful guide for hydrocarbon

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00136.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Oil shales contain organic matter from many sources, deposited under a variety of environmental conditions, which influence the potential for their commercial exploitation. Variations in organic matter type within the oil shales of the Lowmead Basin have been identified with reference to an integrated physico‐chemical classification. The pyrolytic yield of the oil shales has been shown to correlate better with this classification than with a purely chemical classification. While the pyrolytic yield, in litres per metric tonne (l/mt), is satisfactory as a commercial assessment of the oil shales, the addition ofTOC data is an additional indicator of the potential quantity and quality of the shale oi

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00137.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

In all producing basins, most of the oil and/or gas reserves are concentrated in a minority of fields. This distribution of oil and gas reserves is the result of “focusing” during lateral and vertical basin‐wide migration. Although the physico‐chemical and geological processes involved in hydrocarbons migration are not yet fully clarified, lateral migration directions can be established by integrating geological, geophysical and geochemical data. The Petroleum Systems concept is of use here. When combining Petroleum Systems data with well‐controlled regional structure maps, areas of hydrocarbons concentration (i.e. migration focusing) can be defined as areas of the highest exploration potential.Some basic petroleum‐geological data are reviewed from the Eastern Venezuela Basin and the Llanos Basin region in Colombia. By using published Bouguer gravity maps as regional structural form‐line maps, areas of preferred lateral migration are shown to be areas of maximum hydrocarbon accumulations.This leads on to an exploration approach in which Petroleum Systems data and regional (gravity or other) structure maps are used to evaluate acreage for its exploration value with a minimum expenditure of time, manpower and

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00138.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

The accumulation of natural gas in commercial volumes is a function of the dynamic equilibrium between its rates of generation and dissipation. It is proposed here that four fundamental factors control the formation of gasfields: two relate to generation, and two to dissipation. Details of these four factors are discussed.It is suggested that there exist plentiful supplies of “young” gas, located in relatively stable structural environments during post peak‐generation stages, retained in place by efficient

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00139.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00140.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00141.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0141-6421    

DOI:10.1111/j.1747-5457.1994.tb00142.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY