A New Formation Evaluation Technique for the Lower Tertiary in South Texas - Predicting Production in Low Permeability, Fine-Grained Sandstones

2004 ◽  
Author(s):  
John C. Rasmus ◽  
John P. Horkowitz ◽  
Thierry Chabernaud ◽  
Peter Graham ◽  
Malcolm Summers ◽  
...  
Keyword(s):  
South Texas ◽  
Low Permeability ◽  
Evaluation Technique ◽  
Formation Evaluation ◽  
Fine Grained ◽  
Lower Tertiary ◽  
New Formation

A New Formation Evaluation Technique for the Lower Tertiary in South Texas - Predicting Production in Low Permeability, Fine-Grained Sandstones

2006 ◽  
Vol 9 (01) ◽  
pp. 24-31
Author(s):  
John C. Rasmus ◽  
John P. Horkowitz ◽  
Thierry Chabernaud ◽  
Peter Graham ◽  
Malcolm Summers ◽  
...  
Keyword(s):  
South Texas ◽  
Low Permeability ◽  
Evaluation Technique ◽  
Formation Evaluation ◽  
Fine Grained ◽  
Lower Tertiary ◽  
New Formation

Mechanism of Overpressure Formation in Deeply Burial Sandstone

2013 ◽  
Vol 295-298 ◽  
pp. 2736-2739
Author(s):  
Hai Yan Hu
Keyword(s):  
Hydrostatic Pressure ◽  
Capillary Pressure ◽  
Driving Force ◽  
Low Permeability ◽  
Gas Generation ◽  
Tight Sandstone ◽  
Gas Accumulation ◽  
Fine Grained ◽  
Sandstone Reservoirs ◽  
Induced Fractures

Overpressure is often encountered in the Jurassic tight and the overpressure is closely associated with gas generation. The pressure transfer from the over-pressurized mudstones to adjacent tight sandstones might occur through overpressure induced-fractures. The fine-grained coal containing Jurassic sandstone is sensitive to compaction, and the porosity decreases dramatically with the increase of overlying load. As gas migrates into the tight sandstones, it must overcome the capillary pressure which is greater than the hydrostatic pressure. The gas charging pressure in the tight sandstone must be higher than the capillary pressure, resulting in an overpressure buildup within the tight sandstones. Gas shows, low permeability and strong diagenesis in the overpressure of the tight sandstone system have been observed. Additionally, capillary seals are identified as playing an important role in the mechanism of the overpressure formation in tight sandstone reservoirs. Overpressure might be a driving force to create induced fractures in the interval, which has applications for crossing-formation migration and gas accumulation.

Control Factors of Chang 4+5 Reservoir Properties in Jiyuan Oilfield

2013 ◽  
Vol 734-737 ◽  
pp. 1171-1174
Author(s):  
Qi Zhou ◽  
Yan Yi Yin
Keyword(s):  
Sedimentary Facies ◽  
Low Permeability ◽  
Reservoir Properties ◽  
Delta Front ◽  
Factors Affecting ◽  
Low Permeability Reservoir ◽  
Fine Grained ◽  
Control Factors ◽  
Critical Technology ◽  
Storage Potential

Discovered in recent years, Chang 4+5 reservoir group of Yanchang Formation in Jiyuan area is ultra-low permeability reservoir. The evaluation and prediction of the reservoir is the most critical technology in reservoir development. Comprehensive analysis with multiple research approaches shows that the storage potential of the ultra-low permeability reservoir is jointly controlled by sedimentation and diagenesis. Sedimentary factor includes lithology and sedimentary facies, two basic factors affecting the storage potential. The reservoir lithology is of fine-grained debris-arkose and miliary arkose. Pore types are mainly intergranular pores and dissolved pores. The sandstone microfacies in the delta front underwater distributary channel has the best storage potential. Diagenetic factors, including diagenesis types, evolution, intensity, combination etc., have direct influence on the reservoir storage potential. Compaction and calcite cementation are the main factors that weaken the storage potential, whereas carbonate dissolution, especially the dissolution of feldspar plays an important role in the improvement of the storage potential.

The design and application of a polymer EOR trial on Barrow Island

2010 ◽  
Vol 50 (2) ◽  
pp. 702
Author(s):  
Wisnu Widjanarko ◽  
Paul Welton ◽  
Daniel Leòn Echeverría ◽  
Lina Hartanto ◽  
John Scott ◽  
...  
Keyword(s):  
Scale Up ◽  
Field Application ◽  
Petroleum Engineering ◽  
Low Permeability ◽  
High Porosity ◽  
Fine Grained ◽  
Well Spacing ◽  
Chemical Eor ◽  
Induced Fractures ◽  
Design And Application

The design and application of a chemical EOR pilot for a complex, low-permeability waterflood will be presented. Our focus has been on developing appropriate field application options, allowing flexibility of operation against a background of reservoir complexity and uncertainty. Australia’s Barrow Island Windalia reservoir, the nation’s largest onshore waterflood, was developed in the late 1960s. Cumulative oil production to date is over 288 MMSTBO. Planning a chemical EOR scheme needs to address the following reservoir and production characteristics: highly heterogeneous, very fine grained, bioturbated argillaceous sandstone, high in glauconite; high porosity (0.28) but low permeability (5 mD with 20 mD+ streaks); production and injection necessarily stimulated by induced fractures highly saline and hard brine; and, large waterflood pattern volumes (10 MMbbl at 20 acre well spacing). Initial screening recommended that polymers be considered for sweep improvement and conformance control, although reservoir complexity presented a challenge. In this paper, we summarise the subsurface studies, and subsequent petroleum engineering and facilities design, which lead to the successful pilot start-up in May 2009. In particular, we discuss the implications on design and operation of a pilot in a Class A nature reserve. Results from the proposed polymer pilot flood will allow assessment of further chemical EOR applications and potential field-wide scale-up.

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