Latest Issue

2013 Vol.122 No.1

2013 Vol.122 No.1

“Alternation of Hard and Soft Layers (Porcelanite and Siliceous Mudstone)” in the Onnagawa Formation, Akita Prefecture, Japan

Diatomaceous rocks are widely distributed around the circum-Pacific region as Miocene to Lower Pleistocene deposits, including the Monterey Formation, California, USA (Ingle, 1981; Isaacs, 1987). The Middle to Upper Miocene Onnagawa Formation is a typical diatomaceous rock in northern Japan. The alternation of hard and soft layers is a characteristic feature, as shown in this picture. The hard layers consist of thick (< several tens of centimeters) porcelanite, while the soft layers consist of thin (< 10 cm) siliceous mudstone. The Onnagawa Formation is known as an excellent petroleum source rock in Japan. The total organic carbon (TOC) contents of porcelanite and siliceous mudstone are generally 0.1 to 3wt% and 2 to 6wt%, respectively. The Yurihara–Ayukawa oil field is located about 5 km west of this outcrop. The Onnagawa Formation is also a reservoir rock, in which oil and gas are reservoired in pores expanded by the diagenetic phase transformation of silica minerals. Moreover, the Onnagawa Formation draws attention as a shale oil resource.

(Photograph: Yuichi SAITO, Explanation: Takashi TSUJI, Amane WASEDA and Satoru YOKOI; Photographed on May 22, 1988)


Special Issue on “The Slow Subsurface Fluid Flow Processes (Part II): Field Examples and Laboratory Experiments”

An Overview: Special Issue on “The Slow Subsurface Fluid Flow Processes (Part II): Field Examples and Laboratory Experiments”

Tomochika TOKUNAGA, Osam SANO, Kazuyoshi HOSHI, Hiromi HONDA, Tomio INAZAKI, Masao SORAIToshifumi MATSUOKA, Masaya YASUHARA and Hitoshi KOIDE

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 1.

DOI: 10.5026/jgeography.122.1

Preface for the Special Issue on “The Slow Subsurface Fluid Flow Processes (Part II): Field Examples and Laboratory Experiments”

Tomochika TOKUNAGA, Osam SANO, Kazuyoshi HOSHI, Hiromi HONDA, Tomio INAZAKI, Masao SORAI, Toshifumi MATSUOKA, Masaya YASUHARA and Hitoshi KOIDE

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 8.

DOI: 10.5026/jgeography.122.8

Unexpected Form of Oil Accumulation under Abnormally High Pressure Condition (Original Article)

Kazuo NAKAYAMA, Toshihiro TAKAHASHI and Arata KATOH

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 16.

DOI: 10.5026/jgeography.122.16

Evaluation of Average Flow Rate of Subsurface Fluid Based on an Inclined Gas/Water Contact in the Peciko Gas Field, Mahakam Delta Province, East Kalimantan, Indonesia (Original Article)

Hiromi HONDA

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 34.

DOI: 10.5026/jgeography.122.34

Burial Diagenesis of Diatomaceous Deposits and Its Effects on Hydrocarbon Accumulation (Review Article)

Takashi TSUJI, Amane WASEDA and Satoru YOKOI

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 69.

DOI: 10.5026/jgeography.122.69

Compaction Trends of the Niigata Sedimentary Basin Derived from Sonic Log Data and Application to Tectonic History Analysis: Erosion Estimates, Folding and Earthquakes (Original Article)

Kazuyoshi HOSHI

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 90.

DOI: 10.5026/jgeography.122.90

Evaluation of Groundwater Mobility in a Coastal Area Using Groundwater Dating: Borehole Investigation in the West Coastal Area of the Miura Peninsular (Original Article)

Takuma HASEGAWA, Kotaro NAKATA, Hirofumi KONDO, Keiichiro GOTO, Shigenori MURAMOTO, Yuichi TOMIOKA, Kazuyuki GOTO and Kouki KASHIWAYA

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 116.

DOI: 10.5026/jgeography.2012ap01

3D Hydraulic Conductivity Modeling of Fractured Granitic Body Using Geostatistical Techniques and Its Application to Regional Groundwater Flow Analysis (Original Article)

Taiki KUBO, Katsuaki KOIKE, Chunxue LIU, Arata KURIHARA and Toshiyuki MATSUOKA

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 139.

DOI: 10.5026/jgeography.2012ap02

Coseismic and Postseismic Groundwater Pressure Changes (Review Article)

Naoji KOIZUMI

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 159.

DOI: 10.5026/jgeography.2012ap03

Study on the Relation between Pore Fluid Behavior and Longitudinal Wave Dispersion (Original Article)

Satoshi NISHIYAMA, Osam SANO, Hisao ITO and Manabu TAKAHASHI

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 170.

DOI: 10.5026/jgeography.122.170

Effects of Chemical Osmosis on Groundwater Flow in Sedimentary Formations (Original Article)

Mikio TAKEDA, Mitsuo MANAKA, Tsuyoshi HIRATSUKA, Satoru MIYOSHI, Tomochika TOKUNAGA and Kazumasa ITO

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 192.

DOI: 10.5026/jgeography.122.192

Dr. Kinji Magara: A Practical Petroleum Geologist and a Critic of International Engineering Projects and Practices (Letter)

Hiromi HONDA, Kazuo NAKAYAMA, Kazuyoshi HOSHI, Tomochika TOKUNAGA, Ryoichi KOUDA and Toshifumi MATSUOKA

Journal of Geography (Chigaku Zasshi), 2013, 122(1), 214.

DOI: 10.5026/jgeography.122.214

Pictorials

Pictorial 1: Range of Concepts Related to Trap and Seal Mechanisms

Tomochika TOKUNAGA, Hiromi HONDA and Osam SANO

Journal of Geography (Chigaku Zasshi), 2013, 122(1), i.

DOI: 10.5026/jgeography.122.i

Pictorial 2: Spatial and Temporal Scales of Slow Subsurface Fluid Flow Processes

Tomochika TOKUNAGA, Hiromi HONDA and Osam SANO

Journal of Geography (Chigaku Zasshi), 2013, 122(1), ii.

DOI: 10.5026/jgeography.122.ii

Page 27 of 27