Study on the Application of the EPSTM Image Based Post-Stack Spectrum Imaging to the Identification of the Riverway Sand Bodies in Fuyang Oil Layer of Songliao Basin

2013 ◽  
Vol 443 ◽  
pp. 668-674
Author(s):  
Chun Rui Chen ◽  
Xin Rong Zhang ◽  
Jin Ping Liu ◽  
Shi Fang
Keyword(s):  
Relative Error ◽  
Oil And Gas ◽  
Statistical Error ◽  
Oil Field ◽  
Gas Reservoir ◽  
Sand Body ◽  
Spectrum Imaging ◽  
Anisotropic Reservoirs ◽  
Oil And Gas Reservoir ◽  
Sand Bodies

The later-period structure of Fuyang oil layer is complex and its reservoir is mostly composed by the sand bodies of riverways. The oil and gas reservoir features obvious concealment, and also is difficult to identify. To accurately describe the reservoir, a post-stack spectrum imaging was made for the identification of the riverway sand bodies in Fuyang oil layer using EPSTM image in the study area. The statistical error of the riverway sand body identification result using post-stack spectrum imaging was small if the sandstone thickness was greater than 3m. Seen from logging wells geological verification, the riverway identification fit rate was 81.6% on average, the microfacies type identification fit rate was 75%, and the microfacies types identification fit rate of the sandstone thicker than 3m was 80%. Using the nonlinear algorithm of the MDI software, the lithologic prediction was implemented based on the sand group as the unit, and the average prediction fit rate of the sandstone thicker than 3m reached 90% according to the standard relative error less than 20%. Therefore, the post-stack spectrum imaging can exert a significant effect for the anisotropic reservoirs of complex later-period structure, thin sand body, and complex changes, and can meet the needs of the oil field exploration and development to some extent.

Study on the hydrocarbon accumulation models of the upper Es3 in the gentle slope belt of Chexi Depression

2020 ◽  
Author(s):  
Shan Zhao ◽  
Hua Liu
Keyword(s):  
Oil And Gas ◽  
Controlling Factors ◽  
Source Rocks ◽  
Hydrocarbon Accumulation ◽  
Gas Reservoir ◽  
Sand Body ◽  
Main Controlling Factors ◽  
Two Stages ◽  
Oil And Gas Reservoir ◽  
Sand Bodies

<p>Based on the analysis of hydrocarbon source, reservoir forming period, composition and classification of transportation system, and the reasons of failure well in Chexi Depression of Bohai Bay Basin，Two types of hydrocarbon accumulation models in gentle slope belt of Chexi area are established and the main controlling factors of hydrocarbon accumulation are defined. There are three sets of source rocks（Es1、middle and lover submember of Es3、Es4）in Chexi area, the different strata of source rocks have great differences in the Pr/Ph and the content of gammacerane. It has been found that the crude oil of Es3 has a good geochemical correspondence with the middle and lower of Es3 source rocks, and has the characteristics of near source accumulation. The hydrocarbon accumulation in the study area exists in the sedimentary period of the Dongying formation and the sedimentary period of the Guantao formation to the present two stages, which is dominated by late filling. There are two stages of oil and gas filling in the inner and middle belts, and only late stage hydrocarbon filling in the outer slope belt. The hydrocarbon transportation system is mainly composed of faults and sand bodies. The effective source rocks in the middle and lover submember of Es3 are connected with the upper reservoir of Es3 in a small area, which can be directly migrated to the upper sandstone reservoir of Es3 to form lithologic oil and gas reservoir. However, most of the oil and gas in the upper Es3 reservoir need to be vertically migrated by means of oil source fault, and then through the contact of sand bodies such as main channel and fan body, the main oil and gas reservoir will gradually move up with the distance from the source rock. The area with direct contact source reservoir configuration relationship is a "sand body lateral migration" reservoir formation mode, and the main controlling factors of reservoir formation are sand body connectivity and reservoir porosity and permeability. The source reservoir configuration area with fault connection type is a "fault sand combination T-type migration" reservoir forming mode, and the main controlling factors of reservoir forming are migration convergence facies (structural ridge and cross-section ridge).The area of passive reservoir contact is "fault sand combination step migration" reservoir forming mode, and the main controlling factors of reservoir forming are migration convergence facies (structural ridge) and lateral sealing of faults in preservation conditions.</p><p>Key words: Chexi Depression; Source of hydrocarbon; Accumulation period; Fault sand transport combination; Reservoir forming mode</p>

Study on the Geocad-Based Stochastic Model for the Reservoir Controlled by the Facies of the Fuyang Oil Layer in Gaotaizi Area, Songliao Basin

2013 ◽  
Vol 416-417 ◽  
pp. 1935-1941
Author(s):  
Xin Rong Zhang ◽  
Shi Fang ◽  
Jin Ping Liu ◽  
Mao Xin Yang
Keyword(s):  
Oil And Gas ◽  
Correlation Coefficients ◽  
Transformation Method ◽  
Oil Field ◽  
Reservoir Modeling ◽  
Gas Reservoir ◽  
Permeability Model ◽  
Gauss Method ◽  
Oil And Gas Reservoir ◽  
Porosity Model

In Fuyang oil layer, the later-period structure is complex; the reservoir is mostly composed by river-way sand; the oil and gas reservoir is significantly concealed, so it is greatly difficult to identify. To accurately describe the reservoir, facies controlled reservoir is simulated stochastically using Geocad software in the study area: Lithofacies is first established using Gauss truncation algorithm to construct a facies model of mudstone, dry sandstone, poor sandstone, and sandstone, and its fitting rate is 0.814, and then a porosity model is established using sequential Gauss method under the constraint of the lithofacies model and its fitting rate is 0.814, and its correlation coefficients are as follows: 0.845 is for sandstone; 0.893 is for poor sandstone; 0.915 is for dry stone; a permeability model is established using cloud transformation method under the constraint of the porosity model and its fitting rate is 0.732, and its correlation coefficients are as follows: 0.695 is for sandstone; 0.734 is for poor sandstone; 0.824 is for dry sandstone. These prove that the facies controlled reservoir modeling based on Geocad plays a significant role in the areas where the later-period structure is complex and sand is thin and changed intricately. Thus, the needs of the oil field exploration and development can be fulfilled by the model to a certain extent.

Analysis on the well Constraint Inversion of the Jason-Based Layer Flattening Seismic Data under the High-Resolution Isochronous Framework

2013 ◽  
Vol 416-417 ◽  
pp. 1135-1141
Author(s):  
Shi Fang ◽  
Xin Rong Zhang ◽  
Jin Ping Liu ◽  
Chun Lai Xie
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Oil And Gas ◽  
Absolute Error ◽  
Oil Field ◽  
Obvious Effect ◽  
Sand Body ◽  
The Absolute ◽  
Plane Distribution ◽  
Sand Bodies

The later-period structure of Fuyang oil layer is very complex, and its reservoir mainly consists of riverway sand bodies; the oil and gas reservoir is significantly concealed, so it is greatly difficult to identify. In order to accurately predict sand bodies by using seismic data, a well constrained inversion is made to the layer flattening seismic data using Jason software under the high-resolution sequence framework. Through a comprehensive analysis on seismic and geological data, the absolute error is within ±500, the relative error is within 10%; the predicted sand body plane distribution is reasonable, and the absolute error of 82% sand bodies is less than 10%. This proves that well constrained inversion for the Jason-based layer flattening seismic data under the high-resolution isochronous framework has an obvious effect on the areas of complex later-period structure, and thin and complex changed sand bodies. Therefore, it can meet the needs of the oil field exploration and development to a certain extent.

FRSTM Fracture-Based Pre-Stack Elastic Wave Impedance Inversion of Fuyang Oil Layer in Songliao Basin

2013 ◽  
Vol 443 ◽  
pp. 675-680
Author(s):  
Xin Rong Zhang ◽  
Shi Fang ◽  
Jin Ping Liu ◽  
Mao Xin Yang
Keyword(s):  
Elastic Wave ◽  
Prediction Accuracy ◽  
Oil And Gas ◽  
Statistical Error ◽  
Reference Value ◽  
Wave Impedance ◽  
Songliao Basin ◽  
Oil Field ◽  
Impedance Inversion ◽  
Anisotropic Reservoirs

The later-period structure of Fuyang oil layer is complex and its reservoir is mostly composed by the sand bodies of riverways. The oil and gas reservoir features obvious concealment, and also is difficult to identify. To accurately describe the reservoir, a pre-stack elastic wave impedance inversion was made for Fuyang oil layer in Songliao Basin using FRSTM fracture. The pre-stack inversion results statistical error was small if the thickness of sandstone was greater than 3m. The error was close to 100% according to the standard less than 20%, namely the pre-stack inversion prediction accuracy was higher. However, the statistical error was greater and the pre-stack inversion prediction accuracy decreased if the thickness of sandstone was less than 3m, so the prediction result could be only used as a reference value. Therefore, the pre-stack elastic wave impedance inversion can produce a significant effect for the anisotropic reservoirs of complex later-period structure, thin sand body, and complex changes, and can meet the needs of the oil field exploration and development.

scholarly journals Representative permeability types and their application in researching upper Oligocene sedimentary oil reservoir of ThT oil field

2015 ◽  
Vol 18 (2) ◽  
pp. 46-58
Author(s):  
Thuan Van Tran
Keyword(s):  
Oil And Gas ◽  
Gas Permeability ◽  
Oil Field ◽  
Oil Reservoir ◽  
Gas Reservoir ◽  
Oil And Gas Fields ◽  
Upper Oligocene ◽  
Gas Fields ◽  
Oil And Gas Reservoir

Permeability is the indispensable parameter in oil and gas reservoir studies. In fact of researching and operating on oil and gas fields worldwide, there are many types of permeability. Each permeability type has a specific characteristic according to the study purpose. In this article, the specific characteristics of some typical permeability as gas permeability; water permeability, effective permeability; relative permeability … will be analyzed, especially concern to the role of each permeability type in oil reservoir study to assisting researchers has an overview to orient their study.

Sign in / Sign up

Export Citation Format

Share Document