--> Prospectivity Of Reservoir Potential On The Middle Miocene Ngrayong Formation In Grobogan Area: Implications For Petroleum System
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Pacific Section AAPG Convention

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Prospectivity Of Reservoir Potential On The Middle Miocene Ngrayong Formation In Grobogan Area: Implications For Petroleum System

Fadhila Rianda1, Mellinda Arisandy1 and Disa Bambelia1

1University of Padjadjaran

May 4, 2015 Monday 1:40 P.M. Pacific Section AAPG Convention, Oxnard, California

Abstract

Ngrayong Fm is one of rock formation in Grobogan regency Central Java which is deposited above Bulu Formation as older formation in North Rembang Anticlinorium Zone (Pringgoprawiro, 1983). Stratigraphically, Ngrayong Fm is a part of East Java Basin as one of best reservoir as arenite quartz Previous HitsandstoneNext Hit which deposited during middle Miocene. In order to define Ngrayong Fm reservoir potency, field geological mapping could be one of best method continued by laboratory analyses as thin section description. East Java Basin is one of the prolific oil basin with complete petroleum system elements in Indonesia. In this research, regionally geological mapping consist of 5 (five) formation which is older to younger formation consist of Tawun Fm (clastic limestone-source rock), Ngrayong (Previous HitsandstoneNext Hit-reservoir rock), Bulu, Wonocolo (shale-seal rock) and Mundu. Based on micropaleontology analysis and reconstruction of a geological cross section, this formation thickness approximately 183 meters with age Previous HitpredictionNext Hit was in Middle Miocene (N9-N13) based on planktonic foraminifera presence (Bolli & Saunders classification, 1985). This unit deposited on shallow shelf environement or upper neritic (bathimetric zone), based on the presence of Bentonic foraminifera such as Paratrochamina, Haplopharagmmoides pussilus and Articulata carinata (Tipsword, 1956). On the other hand, thin section gave information of Previous HitporosityNext Hit and mineral occurences in Ngrayong Fm. Average Previous HitporosityNext Hit value of Ngrayong Previous HitSandstoneNext Hit is 15.08% (good) and average Previous HitpermeabilityNext Hit value is 203,8 mD (very good). It is caused by quartz dominated in Ngrayong Fm without highly cemented (clean Previous HitsandstoneNext Hit) during diagenesis processes. Based on the analysis of Previous HitporosityNext Hit and Previous HitpermeabilityNext Hit Previous HitsandstoneTop samples taken on this shallow marine facies then it can be inferred that the formation of Ngrayong is a good reservoir for this area.

AAPG Datapages/Search and Discovery Article #90215 © 2015 Pacific Section AAPG Convention, Oxnard, California, May 3-6, 2015