New Evidence on the Stratigraphy and Chronology of 2 140~3 551.63 m Well 424 Section in Karamay Oilfield and “Basin−Mountain” Stratigraphic Comparison
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摘要:
井中地层层序的建立和时代确定,是岩石地层单位划分与对比的关键证据,对正确确立储层意义重大。新疆克拉玛依油田424井上部2 140~3 178 m井段以海相陆源碎屑岩为主,在井深3 176.94~3 178.44 m深灰色粉砂岩与灰黑色细砂岩互层中获得了匙叶粉Noeggerathiops−idozonotriletes等孢粉化石,指示其时代属晚石炭世早—中期(Bashkirian−Moscovian)的可能性最大;下部井段3 178~3 551.63 m以火山角砾岩间夹熔岩为主,在3 340.50~3 343.50 m杏仁状玄武安山岩获得306 Ma的LA−ICP−MS锆石U−Pb年龄;确认上部陆源碎屑岩与下部火山角砾岩二者为整合接触,二分性特征明显。据此,确认上部层位与424井之北哈拉阿拉特山区阿腊德依克赛组建组剖面下段总体可对比;下部层位与424井之北哈拉阿拉特组上部层位可对比。这一成果细分了424井中岩石地层单位,弥补了这2组在山区原建组剖面“原始接触关系不清,新老关系不明”之不足。
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关键词:
- 地层层序 /
- 孢粉化石 /
- 锆石U−Pb年龄 /
- 阿腊德依克赛组与哈拉阿拉特组 /
- 划分与对比 /
- 克拉玛依油田424井
Abstract:The establishment and age determination of the stratigraphic sequence in the well is the key evidence for the division and correlation of rock stratigraphic units. This is significant for the correct establishment of the reservoir. The upper section of well 424 (2 140~3 178 m) in Karamay Oilfield is dominated by marine terrestrial clastic rocks. Sporopollen fossils, such as Noeggerathiops−idozonotriletes were obtained in the interbedded dark gray siltstone and gray−black fine sandstone in the depth of 3 176.94~3 178.44 m, indicating that they formed in early to middle stage of Late Carboniferous (Bashkirian−Moscovian); The lower section 3 178~3 551.63 m is mainly composed of volcanic breccia and intercalated lava. LA−ICP−MS zircon U−Pb age of 306 Ma was obtained from the amygdaloidal basaltic andesite at 3 340.50~3 343.50 m. It is considered that the upper terrestrial clastic rocks and the lower volcanic breccia are integrated contact and show obvious dichotomy characteristics. Accordingly, it is confirmed that the upper part (2 140~3 178 m) of the well 424 is comparable to the lower part of the stratotype section of the Aladeyikesai Formation in the Hala’alate Mountain, and the lower part (3 178~3 551.63 m) is comparable to the upper part of the Hala’alate Formation. This result not only subdivides lithostratigraphic unit of Well 424, but also makes up the deficiency of the unclear original stratigraphic contact relationship and old−new relationship between the stratotype sections of Aladeyikesai and Hala’alate formations in the mountain area.
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图 1 克拉玛依油田地质构造图(b图据王韬等,2022修改)
Figure 1.
表 1 准噶尔盆地西北缘上石炭统—下二叠统岩石地层单位方案与对比标志(李永军等,2021)
Table 1. Upper Carboniferous−Lower Permian stratigraphic units and comparative signatures in the northwest margin of the Junggar Basin
组 岩石组合及划分与对比标志 时代依据 白杨河组P1b 中−基性火山熔岩及火山碎屑岩为主,发育较完整火山机构;近火山口以爆发相(集块岩和火山角砾岩)为主,远离火山口以玄武岩和凝灰岩为主 LA–ICP–MS锆石U–Pb年龄287 Ma(未见顶)(李永军等,2016a) 佳木河组P1jm 陆相磨拉石建造,下岩段以粗碎屑岩为主,岩性有细砾岩、含砾粗砂岩、长石岩屑砂岩等,上岩段主要为粗碎屑岩建造,岩性为灰褐色中−细砾岩夹中砂岩和灰褐色中厚层状中细砾岩以及粗砂岩,砾石成分常见安山质、玄武质及花岗质等岩石 Paracalamites stenocostatus, Lepidodendrales
(李永军等,2016b)阿腊德依克组C2al “下陆源碎屑岩−上火山岩”层序(下段以正常沉积岩为主,上段以火山岩为主)。上段火山岩中熔岩总体多于火山碎屑岩 Athyris circularis,Roemeriporellajunggarensis, Linoproductuscora,eospiriferfasciger;LA−ICP−MS锆石U−Pb年龄为303~295 Ma 哈拉阿拉特组C2h 下部(C2h1~3)以气孔状玄武岩为主,向上见安山岩,上部(C2h4~7)以玄武质角砾岩、集块岩为主。以深灰色、灰绿色区别于红色调的成吉思汗山组。本组与包古图组、希贝库拉斯组的区别是层序上总休下熔岩上火山碎屑岩;火山喷发旋回极为发育有别于成吉思汗山组火山岩 Balakhoniasilimica sp.,Kotorginella tentoria,Stenoscismamazhalaica, Rhomobopora sp. Declinognathodus cf. noduliferous;锆石U−Pb年龄为309~304 Ma(王玉净,1987) 成吉思汗山组C2c 宏观露头以“暗红色、紫褐色”色调最为特色,正常沉积的细、粗碎屑岩均有发现。本组有别于包古图组、希贝库拉斯组的一个重要特征是灰岩层相对较厚,产出较为稳定,且多有生物化石,火山岩相对较发育,岩性以玄武岩为主 Choristites sp.,Pseudotimania sp.; LA−ICP−MS锆石U−Pb年龄为319~310 Ma 表 2 424井玄武安山岩LA–ICP–MS锆石U–Pb分析结果
Table 2. LA–ICP–MS zircon U–Pb analysis results of basaltic andesite in well 424
样号 同位素比值 同位素年龄 232Th
(10−6)238U
(10−6)Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 比值 σ 比值 σ 比值 σ 年龄 σ 年龄 σ 年龄 σ 424-13-5TW02 0.05284 0.00132 0.3703 0.00783 0.05082 0.00083 322 22 320 6 320 5 235.47 253.08 0.93 424-13-5TW17 0.05202 0.00126 0.3479 0.00699 0.04851 0.00078 286 21 303 5 305 5 156.67 36.732 0.43 424-13-5TW20 0.05288 0.00192 0.36043 0.01181 0.04943 0.0009 324 42 313 9 311 6 305.89 189.54 1.61 424-13-5TW24 0.05282 0.00204 0.34622 0.01217 0.04754 0.00088 321 47 302 9 299 5 24.42 58.99 0.41 424-13-5TW29 0.05228 0.00366 0.34316 0.02278 0.04761 0.00122 298 105 300 17 300 8 219.78 342.94 0.64 424-13-5TW30 0.05236 0.00127 0.35551 0.00713 0.04925 0.00079 301 21 309 5 310 5 318.90 414.74 0.77 424-13-5TW34 0.04605 0.00479 0.30158 0.03094 0.0475 0.00083 - 212 268 24 299 5 185.22 369.61 0.50 424-13-5TW39 0.05226 0.00288 0.34897 0.01799 0.04844 0.00108 297 77 304 14 305 7 207.29 268.57 0.77 -
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