scholarly journals Analysis of Seismic Damage Zones: A Case Study of the Ordovician Formation in the Shunbei 5 Fault Zone, Tarim Basin, China

2021 ◽  
Vol 9 (6) ◽  
pp. 630
Author(s):  
Zhan Zhao ◽  
Jingtao Liu ◽  
Wenlong Ding ◽  
Ruiqiang Yang ◽  
Gang Zhao

Fault damage zone has an important influence on subsurface fluid flow and petrophysical properties. Therefore, it is of great significance to study the characteristics of fault damage zone for oil and gas development of ultra-deep carbonate formation. This study uses seismic data and the derived variance attribute to identify two types of damage zones and analyze the spatial geometric characteristics of the damage zones. The results show that the type 1 damage zone is wider than the type 2 damage zone. The width of damage zones distributed on both sides of the Shunbei 5 fault core shows obvious asymmetry, and the damage zone width and throw conforms to the typical power-law distribution on the log-log plot. We discuss the factors affecting the width of the damage zone and its formation process. Finally, we discuss the influence of the damage zones on oil and gas exploration. It seems that the seismic variance attribute is a useful technique for characterizing the ultra-deep strike-slip fault damage zones.

2021 ◽  
pp. 1-45
Author(s):  
Qin Su ◽  
Huahui Zeng ◽  
Yancan Tian ◽  
HaiLiang Li ◽  
Lei Lyu ◽  
...  

Seismic processing and interpretation techniques provide important tools for the oil and gas exploration of the Songliao Basin in eastern China, which is dominated by terrestrial facies. In the Songliao Basin, a large number of thin-sand reservoirs are widely distributed, which are the primary targets of potential oil and gas exploration and exploitation. An important job of the exploration in the Songliao Basin is to accurately describe the distribution of these thin-sand belts and the sand-body shapes. However, the thickness of these thin-sand reservoirs are generally below the resolution of the conventional seismic processing. Most of the reservoirs are thin-interbeds of sand and mudstones with strong vertical and lateral variations. This makes it difficult to accurately predict the vertical and horizontal distribution of the thin-sand bodies using the conventional seismic processing and interpretation methods. Additionally, these lithologic traps are difficult to identify due to the complex controlling factor and distribution characteristics, and strong concealment. These challenges motivate us to improve the seismic data quality to help delineate the thin-sand reservoirs. In this paper, we use the broadband, wide-azimuth, and high-density integrated seismic exploration technique to help delineate the thin-reservoirs. We first use field single-point excitation and single-point receiver acquisition to obtain seismic data with wide frequency-bands, wide-azimuth angles, and high folds, which contain rich geological information. Next, we perform the near-surface Q-compensation, viscoelastic prestack time migration, seismic attributes, and seismic waveform indication inversion on the new acquired seismic data. The 3D case study indicates the benefits of improving the imaging of thin-sand body and the accuracy of inversion and reservoir characterization using the method in this paper.


2014 ◽  
Vol 556-562 ◽  
pp. 4647-4650
Author(s):  
Yong Wang

With the rapid development of China's national economy, oil and gas development and utilization of resources is also increasing, dwindling reserves of conventional oil and gas reservoirs. These inevitably lead to oil and gas exploration direction shifted gradually from shallow depth, by a conventional steering reservoir unconventional oil and gas reservoirs, fractured reservoirs will become the focus of the current oil and gas exploration areas. This paper studied the basic theory of fractured media, from the speed and the amplitude of pre-stack anisotropic characteristics are analyzed theoretically. Researches of these basic theories of EDA media provide a basis for the exploration of the fractured reservoirs.


2015 ◽  
Vol 2 (1) ◽  
pp. 52-57
Author(s):  
Payam Salimi

Geophysical methods widely used in oil and gas exploration. Modeling of gravity data is used extensively to illustrate the geometry and interface between the sediments and bedrock. Which can help the salt dome, anticline folds, dome-shaped uplift of the continental platform and reef masses to be identified. There are various methods to illustrate the bedrock topography, and we will describe one of these methods in present paper. Using the upward continuation, we extract the residual gravity anomaly which in fact shows the local effect of bedrock gravity on the observed gravity. Then, according to the Oldenburg - Parker method, the residual gravity data are inversed and finally the 3D geometry the bedrock is illustrated. It should be noted that some software's like Surfer and Excel are used in this research but the program main code is written using Matlab programming.


2008 ◽  
Vol 48 (1) ◽  
pp. 271 ◽  
Author(s):  
James S D Kernaghan

In 2005 a draft Social Impact Management Plan (SIMP) for the Blacktip Project was prepared by James Kernaghan on behalf of the Blacktip Joint Venture. The SIMP was prepared for the purpose of providing a basis for consultation with the communities that would be potentially affected by the project and the means through which social impacts could be managed. After Eni Australia became 100% owner and operator of the project in December 2005, the SIMP was revised to reflect the values and practices of Eni globally. This paper presents a case study of the early development of social impact management practice for the Blacktip Project in the southern Bonaparte Gulf, northern Australia, in the period from discovery to the middle of the construction phase (end 2001 to end 2007). The primary outcomes, so far, of the social impact management process for the Blacktip Project have largely been positive and work continues to ensure that this remains the case. From a management perspective, the key outcomes have been a Social Impact Assessment (SIA) report, a Social Impact Management Plan (SIMP) and the establishment of an Social Impact Advisory Committee incorporating representatives from the key external stakeholder groups. The paper starts with descriptions of the project and affected communities and the law and policy context in which the project sits. This is followed by a detailed account and discussion about the land acquisition process and the social impact assessment and management plan development, including the scope, methodology and analytical framework used in the SIMP. The paper then provides an account and discussion of the nexus between project development and social impact management. The conclusion gives some observations about the experiences had in the SIMP implementation to date, during the first two construction phases of the project. Often there are a very wide range of social and economic issues that get touched upon in the development of a social impact management plan for a resource project. The resolution of these broader issues is naturally beyond the scope and capability of any company or project and there are often misconceptions in communities about what can be done. The best that a company can do is to approach the management of social impact in a way that tries to build a practical foundation for community development, through consultation with stakeholders in an open and participatory process. The people and organisations that live and work in a region are responsible for the social and economic development of that region, as a part of that community. Some contributions can be made by resource developers, however it is up to the people themselves, the individuals and the families in any community to choose and then pursue their individual and collective destiny. Others cannot do it for them. The paper attempts to provide some insight into the cultural, political, social and commercial realities associated with the development of the project in the particular society involved. In doing so, it is hoped that a useful early case study in the field of social impact management will emerge that may be useful for oil and gas developments and developing communities elsewhere in Australia and the world.


2015 ◽  
Author(s):  
Lars SØrum

Abstract The paper aims to provide insights as to what risk elements are observed in the US shale and tight oil and gas development and how they sit in a European setting. In doing so the paper explores the comparative advantages in prescriptive and performance based approaches for shale risk management and through discussing consequence based vs. risk based philosophies. The author uses metrics for below ground risks to compare risk levels. In doing so the paper aim to qualify what what is perceived as risk and what risks are measured in unconventional oil and gas exploration and production.


Author(s):  
Zhang Yinguo ◽  
Chen Qinghua ◽  
Sun Ke ◽  
Wen Zhenhe ◽  
Xiao Guolin ◽  
...  

AbstractCretaceous is the key exploration target layer in the eastern depression of North Yellow Sea basin, which has a good prospect for oil and gas exploration. Its huge oil and gas resource potential has attracted great attention from petroleum geologists. In this study, the main rock types, reservoir space types, petrophysical characteristics and main controlling factors of Cretaceous reservoir are studied through core observation, thin section identification, petrophysical analysis and scanning electron microscope observation. The results indicate that the main rock types of Cretaceous reservoir in the eastern depression of North Yellow Sea basin are lithic arkose, feldspar lithic sandstone, some feldspar sandstone and a small amount of lithic sandstone. The average porosity is 6.9%, and the average permeability is 0.46 × 10−3 μm, so Cretaceous reservoir in the study area has poor petrophysical characteristics and belongs to low porosity and low permeability reservoir. Cretaceous reservoirs in the study area mainly develop in secondary pores, which are dominated by dissolution pores (including intragranular pores, intercrystalline pores and cleavage pores), followed by fractures. The main factors affecting petrophysical characteristics of Cretaceous reservoir in the study area are provenance properties, sedimentation, diagenesis (including compaction, cementation and dissolution) and tectonism. The provenance properties and sedimentation are the prerequisite conditions affecting petrophysical characteristics. Petrophysical characteristics of feldspar sandstone of Cretaceous reservoir in the study area and lithic arkose are better than that of feldspar lithic sandstone. Both compaction and cementation reduce the porosity and permeability of Cretaceous reservoir in the study area and make petrophysical characteristics become poor, whereas the dissolution and tectonism play an important role in improving petrophysical characteristics of Cretaceous reservoir.


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