MOGHAN BLOCK II
October 18, 1998 - 0:0
1- Introduction -----The proposed block with an extension of about 1,500 sq. km is located in northwestern Iran, between 41o, 30' 48o, 20' longitude and 39o, 10' latitude and is bordered on the east by the Republic of Azerbayjan. This area is 30-850 m above sea level, and the plain north of the Khoruslu mountain is called Dasht-e-Moghan, which has a continental climate with hot summers and cold winters.
The nearest city to the area is Ardebil. Two main asphaltic roads from Ardebil to Parsabad passes through this block. The Bolghar Chai rivser can supply water for seismic and drilling operations. 2-1- Stratigraphy This block with 8,000 m of sedimentary rocks, oil and gas seepages, adjacent to the discovered oil fields (Ghirdarreh and Ortadagh) can be regarded as an interesting subject for Petroleum exploration.
The basement consists of schist and amphibolite which is overlaid by the fossilferous upper Cretaceous limestone. In early Tertiary, following a marine transgression, Paleocene sediments of Qara-Su Formation were deposited. Shales and mudstones of the lower Ojagheshlagh formation (upper Eocene) are the potential source rocks for the oil present in the Oligocene (Zeivar Formation) and Eocene (Ojagheshlagh) reservoirs. The first Petroleum geochemical investigation in the Moghan basin showed that the organically rich shales of the Ojagheshlagh formation are thermally mature enough and contain sufficient oil generating Kerogene to be considered as the source for the Oligocene and Eocene crude oil.
The reservoir rocks in the area mostly feldspathic sandstones of the lower Zeivar formation and thin-bedded argillaceous sandstones of the lower Ojagheshlagh formation are capped by clay and Marl intervals. The Proposed block is located in the southeastern part of trans-Caucasus mountain range and is therefore considered as a continental borderland of the Kura depression. Digdash structure is a narrow anticline with a vertical south flank and a complex east plunge.
Digdash Well No-1 has been drilled in this structure. 3- Previous Works The geological investigation in this area started in 1950. In 1961-1964 gravity and 2D Seismic Survey was carried out. The first stratigraphic well was drilled in Digdash-Khoruslu structures (DD-1). The test did not result in any hydrocarbon but oil and Gaz shows were reported in cores. According to the dipmeter and cores the dip value was high especially in the lower part of the well (65). This means that the well was drilled on a steep flank or a faulted zone of the anticline.
Minimum Expected Scope of Work The following steps are recommended for future exploration of the proposed block. 1- 2D seismic survey about 900 km. 2- Drilling and testing of two wells (in Germi and Digdash anticlines).
The nearest city to the area is Ardebil. Two main asphaltic roads from Ardebil to Parsabad passes through this block. The Bolghar Chai rivser can supply water for seismic and drilling operations. 2-1- Stratigraphy This block with 8,000 m of sedimentary rocks, oil and gas seepages, adjacent to the discovered oil fields (Ghirdarreh and Ortadagh) can be regarded as an interesting subject for Petroleum exploration.
The basement consists of schist and amphibolite which is overlaid by the fossilferous upper Cretaceous limestone. In early Tertiary, following a marine transgression, Paleocene sediments of Qara-Su Formation were deposited. Shales and mudstones of the lower Ojagheshlagh formation (upper Eocene) are the potential source rocks for the oil present in the Oligocene (Zeivar Formation) and Eocene (Ojagheshlagh) reservoirs. The first Petroleum geochemical investigation in the Moghan basin showed that the organically rich shales of the Ojagheshlagh formation are thermally mature enough and contain sufficient oil generating Kerogene to be considered as the source for the Oligocene and Eocene crude oil.
The reservoir rocks in the area mostly feldspathic sandstones of the lower Zeivar formation and thin-bedded argillaceous sandstones of the lower Ojagheshlagh formation are capped by clay and Marl intervals. The Proposed block is located in the southeastern part of trans-Caucasus mountain range and is therefore considered as a continental borderland of the Kura depression. Digdash structure is a narrow anticline with a vertical south flank and a complex east plunge.
Digdash Well No-1 has been drilled in this structure. 3- Previous Works The geological investigation in this area started in 1950. In 1961-1964 gravity and 2D Seismic Survey was carried out. The first stratigraphic well was drilled in Digdash-Khoruslu structures (DD-1). The test did not result in any hydrocarbon but oil and Gaz shows were reported in cores. According to the dipmeter and cores the dip value was high especially in the lower part of the well (65). This means that the well was drilled on a steep flank or a faulted zone of the anticline.
Minimum Expected Scope of Work The following steps are recommended for future exploration of the proposed block. 1- 2D seismic survey about 900 km. 2- Drilling and testing of two wells (in Germi and Digdash anticlines).