巻号一覧
55 巻, 4 号
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早稲田 周, 重川 守1990 年 55 巻 4 号 p. 233-244
発行日: 1990年
公開日: 2008/03/27
ジャーナル フリーThe subsurface structure in the northern part of the Yurihara oil and gas field is composed of east and west blocks by a high angle fault running north and south. Stable carbon isotope ratios of whole oils and biomarker compositions show no differences among crude oils from the various formations (the Lower-Tentokuji, Onnagawa and Nishikurosawa formations). This suggests that the all oils in the Yurihara field have same origin. Carbon isotopes of saturate and aromatic fractions indicate that the oils of east block are generated at higher maturity level than the oils of west block. The results of methane and ethane carbon isotopes of DST gases also suggest that the gases of east block is generated at higher maturity level than those of west block.
On average, the Onnagawa Formation has the highest potential for hydrocarbon generation based on the results of Rock-Eval and TOC analyses. However, within the Onnagawa Formation, the source rock potential varies considerably with depth, and only a part of the Onnagawa Formation has high potential for oil generation. Correlation of oil to source rock by carbon isotope ratios also suggests that the limited parts of the Onnagawa and Funakawa formations are the probable source for oils. Based on depth variation of the isotope, Rock-Eval and TOC data in each well, source rocks from the lowest part of the Funakawa Formation and the upper part of the Onnagawa Formation are best correlated to the oils in the Yurihara field.
From the study of maturity and subsurface structural history, we assume that the hydrocarbons were generated in the large syncline between the Yurihara and Innai structures and migrated to the Yurihara field across a growth reverse fault.抄録全体を表示PDF形式でダウンロード (757K) -
馬場 博子1990 年 55 巻 4 号 p. 245-248
発行日: 1990年
公開日: 2008/03/27
ジャーナル フリーPDF形式でダウンロード (279K) -
島津 光夫1990 年 55 巻 4 号 p. 249-262
発行日: 1990年
公開日: 2008/03/27
ジャーナル フリーDeep-seated volcanic reservoirs of oil and gas in the Niigata basin consist of andesites of the Shiiya and Teradomari formations and rhyolite lavas of the Nanatani formation. Among these volcanic rocks the last one is most suitable as potential hydrocarbon reservoir.
Volcanism of the Nanatani stage is bimodal and occured in trough of back-arc side after the opening the Japan Sea and is dominated by acidic volcanism in the Niigata basin. Acidic rocks of the latter half of the stage are widely distributed beneath the Niigata and Nagaoka Plains. Although acidic rocks of the Nanatani stage were recently ascertained by drilling near Itoigawa, these rocks may be not found in the Kubiki area where is occupied by so-called Nanbayama facies of submarine fan nature according to tectonic development of hinterland. Volcanic rocks erupted after the Teradomari stage are mostly andesite and dacite and are maldistributed.
Recently from geochemical view point, it is stated by many petroleum geologists that maturation of source rocks started after the Teradomari stage and formation of reservoir and migration of oil and/or gas occured during and after the Nishiyama stage in the oil and gas fields having volcanic reservoir. Such views are due to the assumption that temperature capable of maturation and formation of secondary vug was attained by deep burial of thick sediments. However, it will be infered that heating of mudstone around rhyolite body and formation of secondarty vug by post-action alteration of rhyolite took place during and soon after the Nanatani stage.抄録全体を表示PDF形式でダウンロード (933K) -
永井 亮一1990 年 55 巻 4 号 p. 263-268
発行日: 1990年
公開日: 2008/03/27
ジャーナル フリーPDF形式でダウンロード (468K)
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