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JournalISSN: 0253-9985

Oil and Gas Geology 

About: Oil and Gas Geology is an academic journal. The journal publishes majorly in the area(s): Source rock & Facies. It has an ISSN identifier of 0253-9985. Over the lifetime, 202 publications have been published receiving 793 citations.


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Journal Article
TL;DR: In this article, the development characteristics and main controlling factors of multi-stage karstification of the Ordovician carbonates in the Tahe oilfield were discussed based on integration of geological, geophysical and geochemical data.
Abstract: The Middle and Lower Ordovician fractured-vuggy reservoirs in the Tahe oilfield experienced multi-stage karstification caused by multi-stage tectonic events from the Middle Caledonian to the Early Hercynian.Based on integration of geological,geophysical and geochemical data,we discuss the development characteristics and main controlling factors of multi-stage karstification of the Ordovician carbonates in the Tahe oilfield.Four main periods of karstification are identified as follows:the 1st Phase,2nd Phase and 3rd Phase of the Middle Caledonian and the Early Hercynian.The origin,evolution and transformation history of the karst reservoirs are also discussed in this paper.According to this study,the major karstification periods are the Early Hercynian,the 1st Phase and the 2nd Phase of the Middle Caledonian,of which the Early Hercynian is the most important period.The main controlling factors of kastification are paleostructures,karst topography and geological conditions of paleo-drainage-system.

30 citations

Journal Article
TL;DR: It is suggested that when using the tight oil and shale oil terms, one shall follow the rule of "showing respect to customs and facilitating communications" and try to understand fully their connotations and extensions instead of only reading the lines.
Abstract: Based on a thorough literature investigation and a detailed analysis of the meanings and applications of the tight oil and shale oil terms,this paper compares their similarities and differences,and presents suggestions for a better understanding and application of the two terms.Though shale oil also refers to the crude generated through processing kerogen from shale rocks,both terms bear broad and narrow senses when used to indicate the oil from shale or shale-like formations.The current usage of the two terms can be summarized and described in the following three scenarios:(1)They refer to different kinds of unconventional resources,therefore are regarded as totally different from each other;(2)They are thought to be identical and are used alternatively;(3)They are different but also inherently connected.It is suggested that when using the terms,we shall follow the rule of "showing respect to customs and facilitating communications" and try to understand fully their connotations and extensions instead of only reading the lines.To tackle problems encountered during using or understanding the terms,we also shall adapt the policy of "continuous perfecting and timely modification" so as to achieve a more objective definition of the terms.Meanwhile,their international applicability shall also be taken into consideration.

29 citations

Journal Article
TL;DR: In this article, the authors investigated the sedimentary facies,thickness,distribution,organic matter types and content,maturity, porosity, and gas content of the Upper Ordovician-Lower Silurian dark shale in the Sichuan Basin and its periphery.
Abstract: The sedimentary facies,thickness,distribution,organic matter types and content,maturity,porosity,and gas content,of the Upper Ordovician-Lower Silurian dark shale in the Sichuan Basin and its periphery are investigated by field observation and sampling on 25 outcrops and laboratory test of adsorbed gas content,geochemical and physical parametersIn comparison with the major producing gas shales in US,the shale in the study area features in favorable sedimentary facies,large thickness,high TOC,high maturity,high porosity,and high gas content,all being favorable geological conditions for shale gas reservoir developmentParameter models were built for predicting shale gas play fairwaysThe results show that the shale gas play fairways in the study area occur in the Southern Sichuan-Northern Guizhou,Western Hubei-Eastern Chongqing and Northeastern Sichuan(Chongqing)-Northwestern Hubei,among which the Southern Sichuan-Northern Guizhou play fairway is relatively high in gas content,thus is most prospective in shale gas exploration at presentWith the measured gas content,the volumetric method gave a resource volume in the range of 22-85 TCM and a median value of 53 TCM

22 citations

Journal Article
TL;DR: In this paper, the development of reservoirs is controlled by single-factor but multi-stage effects which are dominated by surface karstification, and three sets of cavern-type reservoirs are formed.
Abstract: The Middle-Lower Ordovician in the northern Tarim Basin experienced two phases of karstification in the Middle Caledonian and in the Early Hercynian,respectively.The karstification mainly took place under low temperature meteoric water conditions at surface or near the surface,and was controlled by five factors;that is,structures (prototype basins and tectonic transformation),sequences (configuration and patterns),lithofacies (sedimentary facies and diagenetic facies),source of fluids (surface,formation and deep fluids) and time.This resulted in fractured-vuggy karst reservoirs of various types with strong heterogeneity and significant zonation.In the north zone,reservoir spaces are dominated by big caves and fractures; in the middle zone,reservoir spaces are pores,vuggs and fractures; in the south zone,reservoir spaces are mainly fractures with local vuggs and pores.The major controlling factors vary in different areas and different layers.Multi-stage karstification cycles occurred during the long time and multi-stage exposure in the north of Tahe area.The development of reservoirs is controlled by single-factor but multi-stage effects which are dominated by surface karstification,and three sets of cavern-type reservoirs are formed.In the south where the Upper Ordovician is relatively thick,because of short-time exposure and relatively weak karstification,the development of favorable reservoirs are jointly controlled by peleotopography,exposure time,high-energy facie zones,distribution of fractures and faults as well as later burial and dissolution.

19 citations

Journal Article
TL;DR: In this paper, the authors summarized the status of research in the field of subsalt hydrocarbon exploration, analyzed the distribution characteristics for gypsum-salt cap rocks, and discussed the potentiality and targets of sub-surface exploration within marine seuences in china.
Abstract: Through reverse thinking,we summarize the status of research in the field of subsalt hydrocarbon exploration,analyze the distribution characteristics for gypsum-salt cap rocks,and discuss the potentiality and targets of subsalt hydrocarbon exploration within marine seuences in china.Gypsum and salt are excellent cap rocks which widely occur in the marine sequences of Tarim and Sichuan basins.Subsalt reservoirs are large in resource volume and are the main targets of future exploration.In southern China,gypsum-salt cap rocks mainly occur in the Lower-Middle Cambrian and Lower-Middle Triassic,in addition to the Cretaceous and Paleogene.The gypsum-salt cap rocks are extensive in lateral distribution but large in differences in different areas.For example,the Lower-Middle Triassic gypsum-salt cap rocks are closely related to hydrocarbon distribution in Sichuan Basin.The Cambrian and Lower-Middle Triassic gypsum-salt cap rocks are relatively thick and are the best seals for the marine reservoirs.The Carboniferous gypsum-salt cap rocks also occur in central Hunan province.Moreover,se-veral gypsum-salt cap rocks also exist in Tarim Basin.For the Tarim platform-basin area,there are two sets of major cap rocks,i.e.the Cambrian and the middle-upper Carboniferous gypsum-salt cap rocks,especially the former is the major regional seal.The Cambrian gypsum-salt cap rocks in Bachu-Maigaiti area are large in both areal distribution and continuous thickness.Taking the overall geologic conditions for hydrocarbon accumulation in subsalt area into account,especially the controlling factors of slope and hinge zone for hydrocarbon accumulation,the paper suggest five plays or fields as the major targets of near-term exploration in southern China and Tarim Basin.

17 citations

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Metrics
No. of papers from the Journal in previous years
YearPapers
20201
20151
20146
20138
201235
201136