Stratigraphic Division and Correlation of Carboniferous Strata in Well Che 47 in Chepaizi Area

doi:10.7657/XJPG20220405

Abstract

Abstract:

The 3 370.0-3 456.5 m interval of Well Che 47 in the Chepaizi area is composed of grey-black gravel-bearing medium-coarse-grained lithic sandstone, dark-grey-grey-black gravel-bearing lithic sandstone interbedded with sandstone and carbonaceous siltstone. Its rock assemblage can be correlated with that of the top of the six member of Hala’alat formation on formation section and in Baibandi area. The Late Carboniferous sporopollen fossils such as Protohaploxypinus clarus, P. verrucosus, P. junggarensis, P. jimsarensis, Noeggerathiopsidozonotriletes multirugulatus were found in the carbonaceous siltstone, roughly dated to the Moscovian. The upper interval (2 551.2-3 370.0 m) of Well Che 47 mainly consists of basalt-andesite volcanic breccia, volcanic agglomerate, etc., with very little volcanic lava. The rock assemblage in the upper interval is different from the first to fourth members dominated by volcanic lava of Hala’alate formation, and also significantly distinct from the lower member of Aladeyikesai formation. In addition, this upper interval is above the lithic sandstone at the top of the sixth member of Hala’alate formation, and is well correlated with the seventh member (zircon U-Pb age of 306.9 Ma and 304.5 Ma) on the formation section. Thus, this upper interval is dated to the Late Carboniferous Kasimovian.

Key words: Chepaizi area, Well Che 47, Upper Carboniferous, Hala’alate formation, sporopollen fossil, stratigraphic correlation

CLC Number:

TE121

CHEN Jiangxin, XU Qian, LI Yongjun, ZHU Ming, XU Miao, ZHENG Menglin. Stratigraphic Division and Correlation of Carboniferous Strata in Well Che 47 in Chepaizi Area[J]. Xinjiang Petroleum Geology, 2022, 43(4): 410-416.

Figures/Tables 6

Fig. 1.

Table 1.

Stratigraphic sequence and lithology catalog for Well Che 47"

层号	井深/m	主要岩石类型	主要特征
9	2 551.2—2 769.0	灰黑色安山质集块岩	灰黑色安山质集块岩,层间因剥蚀缺少较多灰黑色安山岩,安山岩中见斜长石斑晶
8	2 769.0—2 769.6	灰黑色安山质角砾岩	灰黑色,安山质火山角砾含量达30%,大小悬殊,角砾粒径为0.2~1.0 cm,角砾间充填物有火山灰
7	2 769.6—2 770.2	灰黑色角砾凝灰岩	灰黑色,安山质角砾含量约为5%,粒径为0.2~0.5 cm;凝灰质结构,成层性较差,见细小方解石脉
6	2 770.2—2 972.0	深灰色火山角砾集块岩	深灰色,风化面呈紫红色,集块大者可达15~20 cm,成分复杂,以红色、灰绿色安山质集块为主,小者约为1~2 cm,局部可见细小方解石脉贯穿
5	2 972.0—3 166.0	深灰色火山角砾岩	深灰色,火山角砾成分复杂,以安山质为主,大小约为0.4~1.0 cm,含量约30%
4	3 166.0—3 337.7	深灰色火山集块岩	深灰色,火山集块成分复杂,以安山质为主,含量为40%~50%,粒径为0.8~1.5 cm,11筒1/8处可见大量方解石充填,11筒4/7段下火山集块逐渐变小,向火山角砾过渡
3	3 337.7—3 339.7	灰绿色蚀变玄武质角砾熔岩	灰绿色;角砾灰成分复杂,含量为5%~10%,大小约为0.4 cm×1.2 cm,颜色为红褐色、灰绿色,成分主要为玄武质,弱蚀变
2	3 339.7—3 454.7	灰黑色含砾粗—中粒岩屑砂岩	与上层岩性一致,灰黑色,成分主要为岩屑;岩屑含量为10%,砾石含量为5%,粒度较粗,砾石大小约0.8 cm,岩屑粒径约为0.2~0.6 cm,成分多样,红色、灰绿色和黑色,见方解石脉
1	3 454.7—3 456.5	深灰—灰黑色含砾岩屑砂岩与砂岩互层,夹含碳粉砂岩	深灰—灰黑色;岩屑含量为5%,粒度较细,触摸污手,表明其含碳较高;岩石中—细纹层发育,纹层近水平,粒度约为0.1 cm;粗砂岩与砂岩互层,互层粗砂岩与砂岩厚度为2∶1,局部方解石脉发育;可见黑色沥青;于C47-15-9BF、C47-15-13BF2中获得丰富孢粉化石

Table 1.

Fig. 2.

Table 2.

Fig. 3.

Table 3.

Comparison of composition of the sporopollen fossils from Well Che 47 and adjacent areas"

阿合奇县色帕巴衣地区石炭系别根他乌组	排66井	准噶尔盆地西北缘克拉玛依市车排子组	车40井	车47井
Protohaploxypinus-Potonieisporites-Hamiapollenites组合：裸子植物花粉占优势（82.0%）：双囊具肋花粉的大量出现,主要有Protohaploxypinus（8.9%~9.8%）、Striatoabieites（2.4%~7.8%）、Potonieisporites（6.7%~7.3%）、Florinites（2.4%~5.6%）、Hamiapollenites（4.4%~4.9%）、Striatopodocarpites（2.2%~2.4%）、Pityosporites（2.2% ~7.3%）、Noeggerathiopsidozonotriletes（0~2.4%）占比低、Cordaitina（3.3%~4.9%）出现	Protohaploxypinus-Triatoabieites-Hamiapollenites组合：裸子植物花粉占优势（85.2%）：以双囊具肋类为主,Protohaploxypinus（11.8%~36.8%）含量最高,Striatoabieites（1.7%~17.8%）、Hamiapollenites（0~14.2%）次之,Striatopodocarpites（0.8%~7.5%）、Vittatina （0~5.3%）、Pityosporites（1.9%~12.0%）、Chordasporites（1.0%~8.0%、）、Platysaccus（0~10.0%）等,单囊类有Striatomonosaccites（0~7.1%）,Striatolebachiites（0~4.0%）、Potonieisporites（1.0%~19.7%）、Florinites（0~10.0%）,Cordaitina（0~8.9%）等,Noeggerathiopsidozonotriletes （0~4.7%）少量	Protohaploxypinus verrucosus-Hamiapollenites chepaiziensis组合：裸子植物花粉占优势（78.0%）：双囊具肋花粉的大量出现,Protohaploxypinus含量最高（8.9%~9.8%）、Hamiapollenites（4.4%~4.9%）、单囊花粉Noeggerathiopsidozonotriletes（0~2.4%）占比低、Cordaitina出现	裸子植物花粉占优势（8.0%~96.0%）：以Florinites（39.0%~52.0%）、Enaosporites（6.0%~26.0%）含量较高,其他可见Striatoabietites（5.0%~6.0%）、Pityosporites （4.0%~26.0%）、Platysaccus（1.0%~4.0%）、Protohaploxypinus（1.0%~2.0%）	裸子植物花粉占优势（98.8%~100.0%）：以具肋双气囊花粉为主,Protohaploxypinus含量最高（27.6%~44.4%）,单囊类花粉Noeggerathiopsidozonotriletes（0~10.3%）也有出现。其余分子数量较少,如Vesicaspora、Potonieisporites、Striatomonosaccites、Striatolebachiites、Striatoanietes、Striatopodocarpites等

Table 3.

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属种名称	C47-15-9BF	C47-15-13BF1	C47-15-13BF2
属种名称	化石含量/粒	化石含量/%	化石含量/粒
Punctatisporites sp. （圆形光面孢（未定种））		1.20
Noeggerathiopsidozonotriletes multirugulatus（多皱匙叶粉）		2.41
Noeggerathiopsidozonotriletes marginellus（小具缘匙叶粉）			1
Noeggerathiopsidozonotriletes sp. （匙叶粉（未定种））		1.20	2
Vesicaspora sp. （聚囊粉（未定种））
Potonieisporites sp. （波托尼粉（未定种））		1.20
Striatomonosaccites sp.（多肋单囊粉（未定种））		1.20
Striatolebachiites sp. （多肋勒巴契粉（未定种））		1.20
Protohaploxypinus clarus（光亮单束多肋粉）	2	1.20
Protohaploxypinus verrucosus（瘤状单束多肋粉）		2.41
Protohaploxypinus junggarensis（准噶尔单束多肋粉）		1.20
Protohaploxypinus irregularis（不规则单束多肋粉）	2	2.41	1
Protohaploxypinus perfectus（完全单束多肋粉）		2.41	1
Protohaploxypinus jimsarensis（吉木萨尔单束多肋粉）		3.61	2
Protohaploxypinus dvinensis（德维单束多肋粉）		2.41
Protohaploxypinus definitus（确定单束多肋粉）		2.41
Protohaploxypinus sp. （单束多肋粉（未定种））	4	12.05	4
Striatoabieites sp. （双束多肋粉（未定种））		1.20
Striatopodocarpites sp. （罗汉松型多肋粉（未定种））		1.20
Gardenasporites sp. （假二肋粉（未定种））		1.20
不能鉴定的具囊花粉	10	57.83	18
蕨类植物孢子总计		1.20
裸子植物花粉总计	18	98.80	29