Affiliation:
1. China University of Geosciences
Abstract
Dissolution plays a dominant controlling role on reservoir properties in delta sandstone of the Permian He 8 Formation, Sulige gasfield. Dissolution forms intergranular dissolved pore and intragranular dissolved pore. Areas with high percentages of dissolved pores occur along delta-plain distributary channel and delta-front underwater distributary channel deposits. Due to dissolution, the porosity increased to 10-17% with permeability as high as 10md. Wells drilled through He 8 sandstones have high daily gas production of 4~6×104m3/d.
Publisher
Trans Tech Publications, Ltd.
Reference12 articles.
1. Bjorlykke, K. Formation of secondary porosity: How important is it? In: Clastic Diagcncsis (Eds D. A. McDonald & R. C. Surdam). Memoir 37, American Association of Petroleum Geologists, Tulsa, 1984, pp.277-286.
2. Dixon S A, Summers D M, Sμrdam R C. Diagenesis and preservation of porosity in Norphlet Formation, southern Alabama. AAPG Bulletin, 73(1989): 707-728.
3. Heald M T, eregg R. C. Differential cementation in the Tμscarora sandstone. Joμrnal of Sedimentary Petrology, 30(1960) 568-577.
4. Bloeh, S. Secondary porosity in sandstones: Significance, origin, relationship to subaerial unconfomities, and effect on predrill reservoir quality prediction. In: Reservoir Quality Assessment and Prediction in Clastic Rocks (Ed. M. D. Wilson). Short Course 30, Society of Sedimentary Geologist, Tulsa, 1998, pp.136-159.
5. Aase, N. E., Bjorkum, P. A, Nadeau, P. H. Effect of grain-coating microquartz on presentation of reservoir porosity. American Association of Petroleum Geologists Bulletin, 80(1998)1654-1673.