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Volume 8, Issue 4 (Suppl)
J Pet Environ Biotechnol, an open access journal
ISSN: 2157-7463
Oil Gas Expo 2017
July 13-14, 2017
Oil and Gas
July 13-14, 2017 Berlin, Germany
3
rd
International Conference and Expo on
J Pet Environ Biotechnol 2017, 8:4 (Suppl)
DOI: 10.4172/2157-7463-C1-035
Longmaxi formation shale gas sweet evaluation and optimization in the Upper Yangtze region
Zhengyu Xu, Jia Dan
and
Liang Xing
PetroChina, China
T
he upper Yangtze region has experienced multi geological events and there is characteristic of high evolution and strong
transformation of the marine shale. So that the shale gas accumulation is very complex. By the comparison of North American
and the upper Yangtze shale, Longmaxi formation organic rich shale of the Upper Yangtze region is older, higher degree of evolution
but the sedimentary environment and lithology basically is the same as North American Barnett shale. Due to Longmaxi shale
experienced multi deformation and different burial environment, its hydrocarbon has entered the over-mature stage. North American
tectonic is relatively stable and its shale is still in the middle-high mature stage. The upper Yangtze shale gas accumulation and
preservation are controlled by the reservoir pore pressure and the sealing of the accumulation unit. Combined the Longmaxi shale
reservoir and the stratigraphy deformation characteristics of the upper Yangtze region, the shale gas sweet is controlled by deep shelf
anoxic face and structure transformation and adjustment zone. Recently, all of the found Longmaxi shale gas reservoirs locate in gentle
wings and axis of residual syncline of the zone. And a series of identification technologies of the shale gas reservoir and prediction
technologies of sweet distribution have been summed in the upper Yangtze region. Longmaxi shale gas layer takes it as a feature: High
gamma, high acoustic time difference, low P-wave and S-wave velocity ratio and with high resistance, low density, low compensation
neutron anomaly. The Longmaxi sweet layer appears low frequency wave impedance reflection and AVO anomalies. The structure
transformation and adjustment zone shows the multi-source convergence and natural net-fracture reservoir conditions, therefore
good accumulation units of syncline belts become shale gas high production in the upper Yangtze region marine. Therefore Longmaxi
shale gas sweet is controlled by deep shelf anoxic face and tectonic transformation and adjustment zone in the upper Yangtze region.
xuzy_hz@petrochina.com.cn3D geochemical modeling with the use of vertical and horizontal relative concentrations of oil biomarkers
for the heavy oil fields development monitoring
Artyom Chemodanov
1
, Akhmadullin Robert
2
, Vladislav Sudakov
1
and
Sergey Usmanov
1
1
Kazan Federal University, Russia
2
Tatneft, Russia
Statement of the Problem:
All heavy oil reservoirs under development in Tatarstan are presented by sands and heterogeneous, with
respect to geology and, thus, the conformance of steam in the reservoir is not uniform. The purpose of this study is to detect lateral
and vertical gradients of relative concentrations of biomarkers presented in oil, which allows assessing potential drainage zones in
the reservoir during the reservoir production by steam injection. In this research, new method for monitoring of steam chamber
development in 3D model was developed and tested.
Methodology & Theoretical Orientation:
Total hydrocarbon fraction was isolated from core extracts and analyzed by GCMS
method (TIC) for detection of various biomarkers and assessment of lateral and vertical gradients of their concentration in lateral.
Findings:
It was found that the proportion of 4- and 1-methyldibenzothiophenes (MDBT) changes in lateral and in vertical directions.
These changes are caused by biodegradation of organic matter. Laboratory research shows that 1-MDBT/4-MDBT ratio in native
reservoir rocks is stable under high temperatures and pressure, so it can be measured in the samples of oil produced by SAGD
method. This measurement will allow assessment of location and direction of steam chamber propagation.
Conclusion & Significance:
In this work the authors have developed geochemical model which can be used for assessment of oil flow
directions during the development of heavy oil fields by SAGD method.
Chemodanov41659@mail.ru