Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
27
Issue 2-D
2016
12
01
GAS SAND DETECTION USING ROCK PHYSICS AND PRE-STACK SEISMIC INVERSION, EXAMPLE FROM OFFSHORE NILE DELTA, EGYPT
65
72
42881
10.21608/absb.2016.42881
EN
Hamed Z.
El-Mowafy
Department of Geology, Al-Azhar University, Cairo, Egypt
Journal Article
2016
07
21
Well logs and three-dimensional (3-D) partial angle stacks and full angle stack seismic volumes are used in<br />this study with the purpose of detecting gas sands using rock physics and pre-stack inversion workflows.<br />Integration of pre-stack inversion and rock physics analysis can improve the characterization of the late<br />Pliocene gas sandstone reservoir, offshore Nile Delta. The inversion was performed using a deterministic<br />wavelet set. Rock physics was used to enhance the VP, VS, and density volumes from the inversion. The present<br />study performed in three phases: AVO analysis, pre-stack inversion, and lambda-mu-rho (LMR) analysis. The<br />results from the different crossplots, such as P-Impedance vs. Vp/Vs, show that the gas sands are clearly<br />separated from brine sands and shale. By maximizing the potential offered from the elastic properties such as<br />λρ, μρ and Vp/Vs ratio we were able to define the limits and cutoffs which sufficiently separate the gas sand<br />bodies. The resulted volumes were used to better define the late Pliocene reservoir and optimize a new well<br />location. The pre-stack inversion and AVO/rock physics studies resulted in a new Gas Initial In Place (GIIP)<br />calculation that was doubled in the P50 case from the original estimation based only on the seismic amplitude<br />data. The chance of success was increased and a new well is proposed to drain the gas in the eastern flank of<br />Channel 1.
https://absb.journals.ekb.eg/article_42881_c39e055c861fe1270a3bd22e2d6212c9.pdf
Al-Azhar University, Faculty of Science (Boys)
Al-Azhar Bulletin of Science
1110-2535
27
Issue 2-D
2016
12
01
GEOMORPHOLOGY AND MINERALOGY OF THE TOP METER BLACK SANDS NORTH WEST OF EL-BURBLLUS LAKE, KAFR AL-SHEIKH GOVERNORATE,EGYPT.
59
82
42888
10.21608/absb.2016.42888
EN
A. H.
El-Afandy
Nuclear Material Authority, P.O. Box 530 Maadi, Cairo, Egypt.
M. I.
Moustafa
Nuclear Material Authority, P.O. Box 530 Maadi, Cairo, Egypt.
H. A.
El Nahas
Nuclear Material Authority, P.O. Box 530 Maadi, Cairo, Egypt.
A. A.
Abdou
Nuclear Material Authority, P.O. Box 530 Maadi, Cairo, Egypt.
M. G.
Barakat
Nuclear Material Authority, P.O. Box 530 Maadi, Cairo, Egypt.
Journal Article
2016
07
27
Geomorphologically, the study area comprises three geomorphic units, the foreshore zone, the backshore<br />flat and coastal sebkhas. El-Sahel (coastal) drain runs parallel to the shoreline. The coastal plain of study area<br />is divided to northern and southern sectors; each sector covers an area of about 10Km2. The northern sector is<br />characterized by relatively highly concentrated black sand especially the near shore area due to marine erosion<br />and the southern sector is characterized by diluted homogenous sediments compared with the northern one.<br />Along the shoreline of the study area, erosion and accretion phenomena are indicated by alternations of<br />highly concentrated and low concentrated sediments, distribution of flaky, discoidal, spherical stones and mud<br />balls. The north-western part of the northern coastal plain sector of the study area is characterized by the highly<br />concentrated black sands extends from the fifth groin eastward about 2.5 Km. These deposits are affected<br />greatly by a wave cut along the shore line. Rate of shoreline retreat along Abu-Khashabah beach in front of El-<br />Matlaa Medak (road) was 43.66 m/y in the time interval between 2003 and 2012.<br />The coastal plain of study area was covered by a total 561 collected samples at one meter depth from the<br />surface were collected within a grid pattern 200m×200m nearly parallel and perpendicular to the shoreline.<br />The northern sector of coastal plain area is covered by 255 samples, whereas the southern sector covered by<br />306 samples. Naturally highly concentrated black sands are deposited in a thin mantle near and parallel to the<br />shoreline of the northern coastal plain sector. The highly concentrated black sands were scraped from the<br />mantle to a depth of about 30 cm.<br />Separation of economic heavy minerals Concentrates using physical ore dressing technique is considered<br />closer to reality; cheap and safe method than the heavy fluid technique.<br />The average content (Av. cont.) and reserve tonnage for each economic mineral in the studied sectors are:<br />magnetite has an average content 11.61% with a reserve 296055 ton, ilmenite has an average content 33.74%<br />with a reserve 860370 ton, garnet has an average content 2.88% with a reserve 73440 ton, leucoxene has an<br />average content 2.58% with a reserve 65790 ton, zircon has an average content 4.11% with a reserve 104805<br />ton, rutile has an average content 1.26% with a reserve 3210 ton and monazite has an average content 0.05%<br />with a reserve 1275 ton with a total average of economic minerals 56.23% and reserve of 1433865 tons.
https://absb.journals.ekb.eg/article_42888_4fb9c4e04262491ff5d53208426eae94.pdf