Definition and distribution prediction of effective source rocks in Lishui Sag, East China Sea Basin
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摘要: 丽水凹陷作为东海陆架盆地具有较大勘探潜力的凹陷，其勘探程度较低，近年来钻探成果较小，因此亟需对烃源岩进行综合评价。通过烃源岩岩石热解实验，饱和烃气相色谱及饱和烃色质分析，对丽水凹陷烃源岩进行综合评价。结果表明，丽水凹陷烃源岩有机质类型以Ⅲ型为主，存在少量的Ⅱ1及Ⅱ2型。月桂峰组烃源岩处于成熟到过成熟阶段，灵峰组烃源岩处于成熟阶段，多数明月峰组烃源岩成熟度较低。根据烃源岩热解参数S1及有机碳含量（TOC）的关系确定月桂峰组有效烃源岩w（TOC）下限为0.7%，灵峰组有效烃源岩w（TOC）下限为1.0%，明月峰组有效烃源岩w（TOC）下限为0.9%。生标参数显示丽水凹陷烃源岩有机质具有混合来源特征，沉积于海陆过渡环境中。有效烃源岩平面分布预测显示，丽水凹陷有效烃源岩的分布较为局限，丽水凹陷西次凹的东北部为有效烃源岩的集中分布区。月桂峰组及灵峰组烃源岩具有较大的产气潜力，应加大丽水凹陷西次凹东北部的气藏勘探力度。Abstract: Lishui Sag, a sag with great exploration potential in the East China Sea Basin, has a low degree of exploration and few drilling results in recent years, so it is urgent to comprehensively evaluate its source rocks. Comprehensive evaluation of source rocks in Lishui Sag was carried out based on the Rock-Eval pyrolysis experiments. The results show that the kerogen type of the source rocks in the Sag is dominated by type Ⅲ, with a small amount of type Ⅱ1 and Ⅱ2 kerogen. Source rocks of Yueguifeng Formation are in mature to over mature stage.Most of the source rocks of Lingfeng Formation are in mature stage. While source rocks in Mingyuefeng Formation are dominantly in low maturity. According to the relationship between total organic carbon (TOC) content and pyrolysis parameter S1, the base limits TOC values of effective source rocks were determined to be 0.7% in Yueguifeng Formation, 1.0% in Lingfeng Formation and 0.9% in Mingyuefeng Formation. Biomarkers show that the source rocks in Lishui Sag are characterized by a mixed origin of organic matter in a transitional environment. Prediction of effective source rocks shows that the effective source rocks in Lishui Sag is locally distributed, and the northeast of West Sub-sag in Lishui Sag is the concentrated distribution area of effective source rocks. The hydrocarbon generation process of source rocks took place in the Paleocene, with a relatively short time (about 4.5 Ma). Source rocks of Yueguifeng Formation and Lingfeng Formation have great gas potential. The exploration of gas reservoirs in the northeast of the West sub-sag of Lishui Sag should be strengthened.
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图 1 丽水凹陷构造位置简图(A)及构造单元划分(B)
Figure 1. Structural location (A) and division of structural units (B) in Lishui Sag
图 3 丽水凹陷烃源岩有机质丰度与生烃潜量特征
Figure 3. Characteristics of organic matter abundance and hydrocarbon generation potential of source rocks in Lishui Sag
图 4 丽水凹陷烃源岩有机质类型判定
Figure 4. Determination of kerogen types of source rocks in Lishui Sag
图 5 丽水凹陷烃源岩深度与Ro关系图
Figure 5. Relationship between depth of source rocks and Ro in Lishui Sag
图 6 丽水凹陷烃源岩饱和烃气相色谱图
Figure 6. Gas chromatograms of saturated hydrocarbon fractions for source rocks in Lishui Sag.
图 7 丽水凹陷烃源岩主峰碳数及∑C21-/ ∑C21+值分布图
Figure 7. Peak carbon number and distribution of ∑C21-/ ∑C21+ values of the source rocks in Lishui Sag
图 8 丽水凹陷烃源岩姥植比分布
Figure 8. Distribution of Pr/Ph values of the source rocks in Lishui Sag
图 9 丽水凹陷烃源岩类异戊二烯与相邻正烷烃比值分布图
Figure 9. Pr/nC17 ratio vs Ph/nC18 ratios of the source rocks in Lishui Sag
图 10 丽水凹陷烃源岩饱和烃色质谱图
C20TT-C23TT.不同碳数三环萜烷；C29H.C29藿烷；C30H.C30藿烷；C21-C22.C21-C22孕甾烷；C27R-C29R.C27-C29规则甾烷
Figure 10. Representative saturated fraction mass chromatograms of source rocks in Lishui Sag
图 11 地化参数指示丽水凹陷烃源岩沉积环境
Figure 11. Biomarker parameters indicate sedimentary environment of source rocks in Lishui sag
图 12 各层位烃源岩TOC质量分数与热解参数S1，S1/TOC关系图
Figure 12. TOC content vs.pyrolysis S1 and S1/TOC of source rocks in Mingyuefeng Formation (A and B), Lingfeng Formation (C and D), Yueguifeng Formation (E and F)
图 13 WZ26-1-1井烃源岩预测TOC与实测TOC对比图
Figure 13. Comparison of TOC prediction results by the ΔlogR methods and measured data for source rocks in well WZ26-1-1
图 16 丽水凹陷有效烃源岩平面分布图
Figure 16. Prediction of horizontal distribution of effective source rocks in Lishui Sag
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[1] 葛和平, 陈志勇, 方来富, 等.丽水凹陷油气成藏期次探讨[J].中国海上油气:地质, 2003, 17(1):46-52. http://d.wanfangdata.com.cn/Periodical/zghsyq-dz200301009 [2] 郭永华, 于水, 葛玲.东海盆地丽水凹陷LS36-1构造成藏机理研究[J].石油勘探与开发, 2003, 30(6):29-31. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syktykf200306008 [3] 葛和平, 陈建平, 陈晓东, 等.东海盆地丽水凹陷天然气类型及其成因探讨[J].中国科学:地球科学, 2007, 3(增刊2):104-110. http://www.cqvip.com/qk/98491X/2007A02/26174469.html [4] 苏奥, 陈红汉, 曹来圣, 等.东海盆地丽水凹陷油气成因、来源及充注过程[J].石油勘探与开发, 2014, 41(5):523-532. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syktykf201405002 [5] 黄志超, 叶加仁.东海海域油气资源与选区评价[J].地质科技情报, 2010, 29(5):51-55. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb201005008 [6] 李德勇, 郭太宇, 姜效典, 等.东海陆架盆地南部剥蚀厚度恢复及构造演化特征[J].石油与天然气地质, 2015, 36(6):913-923. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syytrqdz201506006 [7] Zhang Ming, Zhang Jinliang, Xu Fa, et al.Paleocene sequence stratigraphy and depositional systems in the Lishui Sag, East China Sea Shelf Basin[J].Marine and Petroleum Geology, 2015(59):390-405. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=47479526583ec28434eb9784635150de [8] 张银国, 葛和平, 杨艳秋, 等.东海陆架盆地丽水凹陷古新统层序地层的划分及控制因素[J].海相油气地质, 2012, 17(3):33-39. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=hxyqdz201203005 [9] 陈春峰, 徐春明, 周瑞华, 等.东海陆架盆地丽水凹陷岩性油气藏发育特征与成藏条件[J].中国海上油气, 2013, 25(2):30-35. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zghsyq-gc201302006 [10] 葛和平, 陈晓东, 刁慧, 等.东海盆地丽水凹陷原油地球化学特征及油源分析[J].中国海上油气, 2012, 24(4):8-12, 31. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zghsyq-gc201204002 [11] 崔敏, 赵志刚.东海盆地丽水凹陷油气成藏制约因素分析[J].特种油气藏, 2015, 22(2):18-21, 151. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=tzyqc201502004 [12] 孙玉梅, 席小应.东海盆地丽水凹陷油气源对比与成藏史[J].石油勘探与开发, 2003, 30(6):24-28. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syktykf200306007 [13] 张胜利, 夏斌.丽水-椒江凹陷构造演化特征与油气聚集[J].天然气地球科学, 2005, 16(3):324-328. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=trqdqkx200503014 [14] Peters K E, Walters C C, Moldowan J M.The biomarker guide:Biomarkers and isotopes in petroleum exploration and earth history[M].Second ed.Cambridge:Cambridge University Press, 2005. [15] 韩文学, 麻伟娇, 陶士振, 等.鄂尔多斯盆地上古生界灰岩烃源岩生烃潜力评价[J].地球科学, 2018, 43(2):599-609. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=0120180804879893 [16] 韩小锋, 牛海青, 卜建军, 等.甘蒙地区北山盆地群中口子盆地侏罗系烃源岩特征及评价[J].地质科技情报, 2019, 38(5):46-53. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb201905004 [17] 中国石油天然气总公司.SY/T 5735-1995陆相烃源岩地球化学评价方法[S].北京: 中国石油天然气总公司, 1995. [18] 陈建平, 梁狄刚, 张水昌, 等.中国古生界海相烃源岩生烃潜力评价标准与方法[J].地质学报, 2012, 86(7):1132-1142. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb201207009 [19] Tissot B P, Welte D H.Petroleum formations and occurrence[M].Second ed.Berlin:Springer-Verlag, 1984:131-159. [20] 卢双舫, 张敏.油气地球化学[M].北京:石油工业出版社, 2008:201-206. [21] 兰蕾.南海南部盆地烃源岩特征及其对含油气性的影响[J].地质科技情报, 2019, 38(4):23-29. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb201904004 [22] 郭佩, 刘池洋, 王建强, 等.宁南地区石炭系沉积演化及烃源岩评价[J].地质科技情报, 2015, 34(3):15-23. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb201503003 [23] Diasty W S E, Beialy S Y E, Mostafa A R, et al.Hydrocarbon source rock potential in the southwestern Gulf of Suez graben:Insights from organic geochemistry and palynofacies studies on well samples from the Ras El Bahar Oilfield[J].Marine and Petroleum Geology, 2017, 80:133-153. doi: 10.1016/j.marpetgeo.2016.11.012 [24] Escobar M, Marquez G, Inciarte S, et al.The organic geochemistry of oil seeps from the Sierra de Perija eastern foothills, Lake Maracaibo Basin, Venezuela[J].Organic Geochemistry, 2011, 42:727-738. doi: 10.1016/j.orggeochem.2011.06.005 [25] Hakimi M H, Ahmed A F.Petroleum source rock characterisation and hydrocarbon generation modeling of the Cretaceous sediments in the Jiza sub-basin, eastern Yemen[J].Marine and Petroleum Geology, 2016, 75:356-373. doi: 10.1016/j.marpetgeo.2016.04.008 [26] Zhao Z F, Pang X Q, Li Q W, et al.Depositional environment and geochemical characteristics of the Lower Carboniferous source rocks in the Marsel area, Chu-Sarysu Basin, Southern Kazakhstan[J].Marine and Petroleum Geology, 2017, 81:134-148. doi: 10.1016/j.marpetgeo.2016.12.021 [27] Connan J, Cassou A M.Properties of gases and petroleum liquids derived from terrestrial kerogen at various maturation levels[J].Geochimica et Cosmochimica Acta, 1980, 44:1-23. doi: 10.1016/0016-7037(80)90173-8 [28] Moldowan J M, Seifert W K, Gallegos E J.Relationship between petroleum composition and depositional environment of petroleum source rocks[J].AAPG Bulletin, 1985, 69:1255-1268. [29] 高岗, 柳广弟, 付金华, 等.确定有效烃源岩有机质丰度下限的一种新方法:以鄂尔多斯盆地陇东地区上三叠统延长组湖相泥质烃源岩为例[J].西安石油大学学报:自然科学版, 2012, 27(2):22-26, 118. http://www.cnki.com.cn/Article/CJFDTotal-XASY201202004.htm [30] 高岗, 王银会, 柳广弟, 等.酒泉盆地营尔凹陷有效烃源岩的确认及其展布特征[J].石油实验地质, 2013, 35(4):414-418, 425. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=sysydz201304010 [31] 匡立春, 高岗, 向宝力, 等.吉木萨尔凹陷芦草沟组有效源岩有机碳含量下限分析[J].石油实验地质, 2014, 36(2):224-229. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=sysydz201402017 [32] 高岗, 王绪龙, 柳广弟, 等.准噶尔盆地上三叠统源岩TOC含量预测方法[J].高校地质学报, 2012, 18(4):745-750. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gxdzxb201204015 [33] 王攀, 彭苏萍, 杜文凤, 等.基于测井参数的煤系烃源岩总有机碳含量预测模型[J].煤炭学报, 2017, 42(5):1266-1276. http://d.wanfangdata.com.cn/Periodical/mtxb201705024 -
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