浅海陆棚相沉积特征及其沉积差异性分析——以珠江口盆地文昌A/B/C油田为例
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摘要
珠江口盆地文昌A/B/C油田珠江组一段上部储层发育于浅海陆棚沉积环境,主要砂体为滨外浅滩、滨外砂坝复合体。相对而言滨外砂坝微相因水流的搬运、清洗作用强、泥质含量相对低、砂岩相对纯净而表现为相对优质的储层;但在平面及纵向上滨外砂坝微相变化较快,砂体的叠置关系不清;因此分析滨外浅滩、滨外砂坝沉积微相的特征,并确定储层砂体的展布规律对优质储层预测具有重要意义。研究通过3个油田的沉积差异性分析认为,构造走向控制砂体展布方向,距物源区远近和水体深浅决定储层砂体物性特征,文昌B油田近物源、水体较浅,其构造高部位的滨外砂坝砂体为优质储层分布区;文昌A油田距离物源较远、水体较深,储层物性最差;文昌C油田储层物性中等。
The upper section of the First Group in Zhujiang Formation of Wenchang A/B /C Oil Field in Pearl River Mouth basin is developed in a neritic shelf sedimentary environment,whose main sand body of is a combination of offshore shallow and offshore bar,the latter microfacies manifests as relatively high-quality reservoir which owes to the potamic transport,highly sand-cleaning effect,relatively low mud contend and relatively pure sandstone. However,the current situation that offshore bar microfacies changes rapidly in the plane and in vertical,making the superimposed relationship among sand body unsharp accordingly. It is necessary and significant to analyze the sedimentary feature of offshore shallow and offshore bar microfacies,as well as confirm the rule of sandstones distribution to predict advantageous reservoir. By analyzing the sedimentary differences among three oil fields,the results indicate that the distributed direction of sand body is controlled by structural trend,the porosity and permeability of sand body is up to the distance towards provenance region and the depth of water. Wenchang B Oil Field,which is close to the provenance region and belongs to shallow-water area,has an advantageous reservoir distribution with its offshore bar located in the higher position of structure; Wenchang A Oil Field,which is far from the provenance region and belongs to deep-water area,has the worst physical properties; Wenchang C Oil Field has medium physical properties.
The upper section of the First Group in Zhujiang Formation of Wenchang A/B /C Oil Field in Pearl River Mouth basin is developed in a neritic shelf sedimentary environment,whose main sand body of is a combination of offshore shallow and offshore bar,the latter microfacies manifests as relatively high-quality reservoir which owes to the potamic transport,highly sand-cleaning effect,relatively low mud contend and relatively pure sandstone. However,the current situation that offshore bar microfacies changes rapidly in the plane and in vertical,making the superimposed relationship among sand body unsharp accordingly. It is necessary and significant to analyze the sedimentary feature of offshore shallow and offshore bar microfacies,as well as confirm the rule of sandstones distribution to predict advantageous reservoir. By analyzing the sedimentary differences among three oil fields,the results indicate that the distributed direction of sand body is controlled by structural trend,the porosity and permeability of sand body is up to the distance towards provenance region and the depth of water. Wenchang B Oil Field,which is close to the provenance region and belongs to shallow-water area,has an advantageous reservoir distribution with its offshore bar located in the higher position of structure; Wenchang A Oil Field,which is far from the provenance region and belongs to deep-water area,has the worst physical properties; Wenchang C Oil Field has medium physical properties.
引文
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7 Li D S.Tectonic types of oil and gas basins in China.Beijing:Petroleum Industry Press,1991;181-195
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13 Magoon L M,Dow W G.The petroleum system.In the petroleum system from source to trap.AAPG Memoir60,1994:3-24
14林小兵,刘莉萍,田景春,等.川西坳陷中部须家河组五段致密砂岩储层特征及主控因素.石油与天然气地质,2014;35(2):224-230Lin Xiaobing,Liu Liping,Tian Jingchun,et al.Characteristics and controlling factors of tight sandstone reservoirs in the 5th member of Xujiahe Formation in the central of western Sichuan Depression.Oli&Gas Geology,2014;35(2):224-230
15尤丽,李才,刘景环.文昌A凹陷珠海组储层区域成岩作用特征及定量评价.大庆石油学院学报,2012;36(2):7-13You Li,Li Cai,Liu Jinghuan.Regional diagenesis feature and quantitative evaluation from Zhuhai Formation reservoir in Wenchang A Sag.Journal of Daqing Petroleum Institute,2012;36(2):7-13
16 Curtis C D.Isotopic evidence for source of diagenetic carbonates formed during burial of organic-rich sediments.Nature,1977;269(5625):209-213
2周雯雯,张伙兰.珠三拗陷有机包裹体应用研究.岩石学报,2000;16(4):677-686Zhou Wenwen,Zhang Huolan.Study on application of organic inclusions in Zhu-Ⅲdepression.Journal of Rock,2000;16(4):677-686
3徐新德,黄保家.珠三拗陷琼海凸起油气运聚研究.石油勘探与开发,2000;27(4):41-44Xu Xinde,Huang Baojia,et al.Research of hydrocarbon migration and accumulation on Qionghai uplift in Zhu-Ⅲdepression.Petroleum Exploration and Development,2000;27(4):41-44
4龚再升,李思田.南海北部大陆边缘盆地油气藏动力学研究.北京:科学出版社,2004:289-298Gong Zaisheng,Li Sitian.Hydrocarbon accumulation dynamics research of continental margin basins in the north of South China Sea.Beijing:Science Press,2004:289-298
5张迎朝,甘军,邓勇,等.珠江口盆地西部文昌B凹陷及周边油气成藏组合.中国海上油气,2009;21(5):303-307Zhang Yingzhao,Gan Jun,Deng Yong,et al.Pool-forming pattern o hydrocarbon plays and favorable exploration trend in Wenchang B sag and surrounding areas ZhuⅢdepression Pearl River Mouth Basin.China Offshore Oil and Gas,2009;21(5):303-307
6徐新德,黄保家,李里,等,珠三拗陷琼海凸起油气运聚研究.石油勘探与开发,1999;27(4):41-44Xu Xinde,Huang Baojia,Li Li,et al.A study on the migration and accumulation of oil and gas in Qionghai up lift ZhuⅢdepression.Petroleum Exploration and Development,1999;27(4):41-44
7 Li D S.Tectonic types of oil and gas basins in China.Beijing:Petroleum Industry Press,1991;181-195
8何胜林.南海西部海域文昌A-B油田低阻成因分析.世界地质,2011;30(3):404-409He Shenglin.Analysis on low-resistivity origin of Wenchang A and Boilfields in Western South China Sea.World Geology,2011;30(3):404-409
9杨玉卿,崔维平,李俊良,等.电成像测井在珠江口盆地西部低阻油层研究中的应用.中国海上油气,2011;23(6):369-373Yang Yuqing,Cui Weiping,Li Junliang,et al.An application of electric imaging logging to research low-resistivity oil interval in the western Pearl River Mouth Basin.China Offshore Oil and Gas,2011;23(6):369-373
10龚再升,杨甲明,杨祖序,等.中国近海大油气田.北京:石油工业出版社,1997:7-67Gong Zaisheng,Yang Jiaming,Yang Zuxu,et al.Giant oil and gas fields in China of shore.Beijing:Petroleum Industry Press,1997:7-67
11王庭斌.中国大中型气田成藏的主控因素及勘探领域.石油与天然气地质,2005;26(5):582-589Wang Tingbin.Main control factors of large and medium gas fields and exploration domains in China.Oil&Gas Gealogy,2005;26(5):582-589
12朱伟林.中国近海新生代含油气盆地古湖泊学与烃源条件.北京:地质出版社,2009:25-80Zhu Weilin.Palaeolimnology and source rock conditions of the Cenozoic petroliferous basins in China offshore.Beijing:The Geological Press,2009:25-80
13 Magoon L M,Dow W G.The petroleum system.In the petroleum system from source to trap.AAPG Memoir60,1994:3-24
14林小兵,刘莉萍,田景春,等.川西坳陷中部须家河组五段致密砂岩储层特征及主控因素.石油与天然气地质,2014;35(2):224-230Lin Xiaobing,Liu Liping,Tian Jingchun,et al.Characteristics and controlling factors of tight sandstone reservoirs in the 5th member of Xujiahe Formation in the central of western Sichuan Depression.Oli&Gas Geology,2014;35(2):224-230
15尤丽,李才,刘景环.文昌A凹陷珠海组储层区域成岩作用特征及定量评价.大庆石油学院学报,2012;36(2):7-13You Li,Li Cai,Liu Jinghuan.Regional diagenesis feature and quantitative evaluation from Zhuhai Formation reservoir in Wenchang A Sag.Journal of Daqing Petroleum Institute,2012;36(2):7-13
16 Curtis C D.Isotopic evidence for source of diagenetic carbonates formed during burial of organic-rich sediments.Nature,1977;269(5625):209-213