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印度东部大陆边缘克里希纳—戈达瓦里盆地油气分布规律 被引量:10
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作者 冯杨伟 屈红军 +2 位作者 张瑾爱 郑艳荣 马晓玲 《西北大学学报(自然科学版)》 CAS CSCD 北大核心 2016年第3期408-414,共7页
以印度东部大陆边缘克里希纳—戈达瓦里盆地油气地质条件、勘探现状和油气田最新资料为基础,采用油气地质综合分析方法,探讨研究区油气分布规律及其主控因素,预测有利勘探方向。研究结果表明,"源热共控"的印度东部大陆边缘克... 以印度东部大陆边缘克里希纳—戈达瓦里盆地油气地质条件、勘探现状和油气田最新资料为基础,采用油气地质综合分析方法,探讨研究区油气分布规律及其主控因素,预测有利勘探方向。研究结果表明,"源热共控"的印度东部大陆边缘克里希纳—戈达瓦里盆地油气分布的规律为"内油外气":靠近海岸线附近的低热流值区发育大型油田,以RAVVA油田为代表,另有一些中小型油田;在靠近深水一侧高热流值区发育以DHIRUBHAI为代表的巨型天然气田,另有若干富气远景圈闭。研究后认为,研究区盆地油气分布主控因素是主力烃源岩的热演化受控于地热场,二者相匹配共同控制盆地油气的分布。 展开更多
关键词 印度东部大陆边缘 源热共控 克里希纳—戈达瓦里盆地 分布规律 主控因素
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印度东部盆地群地质特征、油气成藏与深水区勘探潜力 被引量:5
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作者 秦雁群 张光亚 +4 位作者 计智峰 李志 吴义平 王兴龙 梁旭 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2017年第5期691-703,共13页
基于印度东部盆地群区域构造沉积演化、地层充填和油气地质特征,建立深水扇体发育和成藏模式,分析深水区勘探潜力。印度东部被动大陆边缘形成源自东冈瓦纳古大陆裂解,经历了克拉通内裂谷(P_1—T)、东冈瓦纳裂谷(J_1—K_1)、裂后热沉降(K... 基于印度东部盆地群区域构造沉积演化、地层充填和油气地质特征,建立深水扇体发育和成藏模式,分析深水区勘探潜力。印度东部被动大陆边缘形成源自东冈瓦纳古大陆裂解,经历了克拉通内裂谷(P_1—T)、东冈瓦纳裂谷(J_1—K_1)、裂后热沉降(K_2)和被动大陆边缘(K_3—N)4个演化阶段,发育裂后热沉降期末、被动大陆边缘I期末和Ⅱ期末3个明显不整合,形成裂谷期和被动大陆边缘Ⅰ期、Ⅱ期、Ⅲ期4套构造层,被动大陆边缘阶段沉积是盆地群地层主体,形成近岸叠覆型扇复合体、与三角洲有关的断裂坡折部位低位扇和前缘浊积扇两类富油气沉积体系。盆地内发育下二叠统、下白垩统、上白垩统和古近系4套证实的烃源岩,平面分布差异大;发育裂谷期砂岩和碳酸盐岩、裂后热沉降和被动大陆边缘时期三角洲和深水重力流砂岩等多种类型储集层,总体为中孔、低渗条件;油气盖层多、厚度变化大,漂移期多为区域封盖,其他时期则以局部封盖为主;形成上白垩统砂岩、古近系砂岩、新近系砂岩等8个成藏组合。被动大陆边缘阶段深水区油气勘探在平面上应以克里希那和高韦里河流三角洲地区为主,纵向上则以被动大陆边缘阶段与构造相关三角洲砂体、断裂坡折处低位扇、85°E海脊附近和高韦里盆地南部海域近岸扇复合体为重点。 展开更多
关键词 被动大陆边缘 深水油气勘探 深水扇 三角洲 默哈讷迪盆地 克里希那—戈达瓦里盆地 高韦里盆地 印度东部
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Age of the earliest transgressive event in the Krishna-Godavari Basin, India: evidence from dinoflagellate cysts and planktonic foraminifera biostratigraphy
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作者 Ashish Kumar Mishra Nallamuthu Malarkodi +2 位作者 Arun Deo Singh Dinesh Babu Vandana Prasad 《Journal of Palaeogeography》 SCIE CSCD 2020年第1期60-70,共11页
A combined biostratigraphic study of dinoflagellate cysts and foraminifera was carried out on Early Cretaceous subsurface well cutting sediments from well A(DNG)(2800–2746 m depth)from the Krishna-Godavari Basin,Indi... A combined biostratigraphic study of dinoflagellate cysts and foraminifera was carried out on Early Cretaceous subsurface well cutting sediments from well A(DNG)(2800–2746 m depth)from the Krishna-Godavari Basin,India.The last appearance datum of marker species of dinoflagellate cysts and planktonic foraminifera was considered for the construction of the biostratigraphic framework.The study shows dominance of Early Cretaceous marker dinoflagellate cysts Cassiculosphaeridia magna,Cribroperidinium perforans,Hystrichodinium voigtii,Kleithriasphaeridium eoinodes,and planktonic foraminifera Hedbergella aptiana,Hedbergella mitra,Hedbergella praelippa,Hedbergella tardita,Microhedbergella miniglobularis and Hedbergella mitra species.In addition to this,the dinoflagellate cyst data were compared with the dinoflagellate biozones of Austral and Tethyan provinces.Based on earlier micropalaeontological records from the Krishna-Godavari Basin and the present study,a latest Barremian-early Aptian age has been determined for the earliest marine transgression in the Krishna-Godavari Basin.The early marine incursion during late Barremian-earliest Aptian in the Krishna-Godavari Basin compared to Albian age in Cauvery Basin suggests the opening of east coast from north to south. 展开更多
关键词 BIOSTRATIGRAPHY krishna-godavari basin PALAEOENVIRONMENT
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Geochemical evidences of trace metal anomalies for finding hydrocarbon microseepage in the petroliferous regions of the Tatipaka and Pasarlapudi areas of Krishna Godavari Basin,India 被引量:1
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作者 Rasheed M A Lakshmi M +3 位作者 Rao P L S Kalpana M S Dayal A M Patil D J 《Petroleum Science》 SCIE CAS CSCD 2013年第1期19-29,共11页
The long-term seepage of hydrocarbons, either as macroseepage or microseepage, can set up near-surface oxidation reduction zones that favor the development of a diverse array of chemical and mineralogical changes. The... The long-term seepage of hydrocarbons, either as macroseepage or microseepage, can set up near-surface oxidation reduction zones that favor the development of a diverse array of chemical and mineralogical changes. The bacterial oxidation of light hydrocarbons can directly or indirectly bring about significant changes in the values of pH and Eh of the surrounding environment, thereby also changing the stability fields of the different mineral species present in that environment. The paper reports the role of hydrocarbon microseepage in surface alterations of trace metal concentrations. In this study trace metal alterations were mapped that appear to be associated with hydrocarbon microseepages in the oil/ gas fields. A total of 50 soil samples were collected near oil and gas fields of the Tatipaka and Pasarlapudi areas of the Krishna Godavari Basin, Andhra Pradesh. The soil samples were collected from a depth of 2-2.5 m. The paper reports the chemical alterations associated with trace metals in soils that are related to hydrocarbon microseepages above some of the major oil and gas fields of this petroliferous region. Trace metals, such as scandium (Sc), vanadium (V), chromium (Cr), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), barium (Ba) and strontium (Sr), in soil samples were analyzed using inductively coupled plasma- mass spectrometry (ICP-MS). The concentrations of Sc (8 to 40 mg/kg), V (197 to 489 mg/kg), Cr (106 to 287 mg/kg), Co (31 to 52 mg/kg), Ni (65 to 110 mg/kg), Cu (88 to 131 mg/kg), Zn (88 to 471 mg/kg), Ba (263 to 3,091 mg/kg) and Sr (119 to 218 mg/kg) were obtained. It was observed that the concentrations of trace elements were tremendously increased when they were compared with their normal concentrations in soils. The analysis of adsorbed soil gas showed the presence of high concentrations of YC2+ (C2H6, C3H8 and n-C4H10) ranging from 7 to 222 μg/kg respectively. Integrated studies of trace elements over adsor 展开更多
关键词 Hydrocarbons microseepage trace metal alterations adsorbed soil gas krishna godavari basin
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