大巴山、米仓山南缘早寒武世礁滩发育特征  被引量:23

EARLY CAMBRIAN REEFS AND BANKS DEVELOPMENT IN SOUTHERN MARGIN OF DABA Mt.AND Micang Mt.

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作  者:张廷山[1] 兰光志[1] 沈昭国[1] 王顺玉[1] 姜照勇[1] 

机构地区:[1]西南石油学院,四川成都610500

出  处:《天然气地球科学》2005年第6期710-714,共5页Natural Gas Geoscience

基  金:"九五"国家重点科技攻关项目补充课题(编号:99-110-补2-08-01);四川省重点学科建设项目(编号:SZD0414)联合资助

摘  要:早寒武世时大巴山、米仓山南缘属上扬子地台的北缘部分,处在碳酸盐台地边缘相带环境中。该区生物礁滩较发育,主要分布于陕西南郑、西乡、镇巴、紫阳等地和大巴山、米仓山南缘的四川南江一带;生物礁滩的类型有兰藻—古杯礁、凝块石灰泥丘、核形石生物层、生屑滩和鲕粒滩;造礁生物类型有古杯、兰藻细菌等,附礁生物除单体规则古杯外,还有三叶虫、腕足类、海百合、海绵骨针等。通过对寒武纪灰泥丘凝块石作生物标志化合物分析,证明了其有机质生源为菌藻类微生物。指出由于相对海平面升降和古地理环境的控制,使本区礁滩的发育具有明显的旋回性并控制了礁滩的发育类型和分布,礁滩层位自西向东有升高的趋势。Exploration in deep-water hydrocarbon has a fast increase in the world. The water depth for drilling well arrived to 3 050 m in 2004. Three giant China oil companies (CNPC, CNOOC, SINOPEC) launch the oil exploration in the deep water region of the South China Sea (SCS). According to the discoveries in the world, all of them are distributed in the passive continental margin. Three giant sedimentary sequences have been deposited in the basin, those are prorifting, rifting and breakup sedimentary sequences. Source rocks are lacustrine and shore facies, as well as after-rifting drift marine limestone and shale. The reservoirs are characterized by the deep-water turbidite sandstones, and rifting sandstone. The hydrocarbon reservoirs preserved in the various trap in the rifting basin, and some unique deep-water turbidite sandstone, and diapir structures. By the geological analysis of the two deep water regions in the SCS, the same petroleum geological features and richful hydrocarbon exist in the SCS.

关 键 词:生物礁滩 发育特征 早寒武世 大巴山、米仓山南缘 

分 类 号:TE122.21[石油与天然气工程—油气勘探]

 

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