Hydrocarbon Generation Conditions and Regional Comparison of the Lower Jurassic Kangsu Formation in Washixia Sag, Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2019.06.10

Abstract

Abstract:

The Southeast Depression of the Tarim Basin has not seen much breakthrough in oil and gas exploration due to the hydrocarbon source conditions. Currently, the Jurassic Yangye and Kangsu formations have been suggested to have hydrocarbon generation potential. Based on field geological surveys, section survey, sample collection and geochemical test are completed. Combined with the drilling and sample analysis data from the wells Ruocan 1, Ruocan 2 and Qiedi 1, we discuss the lithology, spatial distribution characteristics and geochemical features of the source rock of the Lower Jurassic Kangsu Formation in the Washixia Sag, SE Tarim Basin. The source rocks are mainly dark mudstone and carbonaceous mudstone with a thickness of about 60 to 140 m (25% of the formation). Organic abundance of well Ruocan 1 and Hongliugou Old Coal Mine is relatively high, and the organic carbon contents of dark mudstones and carbonaceous mudstones are 1.2% to 4.4%, and 5.0% to 39.6%, respectively. The types of kerogen are Ⅱ₂ to Ⅲ, which are mainly in the low-mature to mature stage. Compared with the sedimentary source rocks in the same period of the basin periphery, hydrocarbon potential of the source rocks in the Washixia Sag is lower than that in the Kuche Depression in the northern Tarim Basin, but higher than that in the Kuzigongsu Section of the Kashi Sag (SW Tarim Basin). Therefore, we consider that the Washixia Sag has higher hydrocarbon potential, especially for the deep concave area southeast of well Ruocan 1, and the piedmont subsag around Hongliugou Old Coal Mine-Qigeleke.

Key words: Tarim Basin, Washixia Sag, Kangsu Formation, source rock, geochemical characteristics

CLC Number:

TE122.1

ZHANG He, JIANG Zhenglong, LI Yajun, LIANG Shuang, FU Wenkai. Hydrocarbon Generation Conditions and Regional Comparison of the Lower Jurassic Kangsu Formation in Washixia Sag, Tarim Basin[J]. Geoscience, 2019, 33(06): 1241-1251.

Figures/Tables 10

Fig.1 Distribution and tectonic division of the Washixia Sag in the Tarim Basin

Fig.2 Characteristics of the Kangsu Formation in the Washixia Sag

Fig.3 Geological section of the Kangsu Formation in the Hongliugou Old Coal Mine(A), Qigeleke(B), Aishahantuohai(C) (locations shown in Figure 1)

Fig.4 Regional well correlation across the Washixia Sag, showing the lithographical features of the Kangsu Formation

Table 1 Thickness of the Lower Jurassic Kangsu source rock in the Washixia Sag

剖面或钻井		烃源岩厚度/m	(烃源岩/地层)/%
江尕勒萨依	317.0	85.0	26.8
红柳沟老煤矿	477.4	118.2	24.8
红柳沟新煤矿	287.6	61.7	21.5
其格勒克	469.7	113.0	24.1
艾莎汗托海	359.6	107.7	29.9
若参1井	607.5	63.0	10.4
若参2井	237.0	80.0	33.8
且地1井	855.6	140.5	16.4

Fig.5 Lithological and geochemical parameters of the Lower Jurassic Kangsu source rocks in the Hongliugou Old Coal Mine

Table 2 Geochemical parameters of the Lower Jurassic Kangsu source rocks in the Washixia Sag

剖面或钻井	岩性	TOC/%	Pg/(mg/g)	T_max/℃	R_o/%	烃源岩评价
若参1井	暗色泥岩	$1.5 ~ 4 . 2 * 3.0$	$0.9 ~ 5.0 2.5$	$431 ~ 447 437$	$0.74 ~ 0.83 0.79$	中-好
	碳质泥岩	$5.0 ~ 39.6 25.0$	$3.0 ~ 50.5 27.4$	$424 ~ 436 431$	$0.48 ~ 0.64 0.56$	中-好
	碳质粉砂岩	$6.4 ~ 69.8 27.5$	$7.0 ~ 130.4 49.5$	$427 ~ 443 435$	$0.73 ~ 0.94 0.83$	好
红柳沟老煤矿	暗色泥岩	$3.4 ~ 5.2 4.4$	$6.1 ~ 6.9 6.5$	$427 ~ 435 430$	$0.39 ~ 0.44 0.42$	好
	碳质泥岩	$3.9 ~ 26.8 15.3$	$2.5 ~ 27.0 14.8$	$425 ~ 429 427$	$0.53 ~ 0.60 0.57$	中
	煤	$54.4 ~ 70.0 60.1$	$31.5 ~ 108.1 64.4$	$420 ~ 426 423$	$0.54 ~ 0.58 0.55$	中-差
其格勒克	暗色泥岩	$1.2 ~ 4.4 2.9$	$0.06 ~ 3.9 0.9$	-	-	中
其格勒克	碳质泥岩	$20.0 ~ 23.5 21.6$	$8.7 ~ 52.3 24.4$	-	-	中
艾莎汗托海	暗色泥岩	$0.4 ~ 3.8 1.4$	$0.06 ~ 1.3 0.3$	$417 ~ 542 514$	-	中-差
	碳质泥岩	$0.6 ~ 29.6 10.8$	$0.07 ~ 16.6 5.7$	$452 ~ 542 512$	-	中-差
	煤	$16.0 ~ 38.9 29.9$	$0.03 ~ 4.7 1.2$	-	-	差

Table 2 Geochemical parameters of the Lower Jurassic Kangsu source rocks in the Washixia Sag

剖面或钻井	岩性	TOC/%	Pg/(mg/g)	T_max/℃	R_o/%	烃源岩评价
若参1井	暗色泥岩	$1.5 ~ 4 . 2 * 3.0$	$0.9 ~ 5.0 2.5$	$431 ~ 447 437$	$0.74 ~ 0.83 0.79$	中-好
	碳质泥岩	$5.0 ~ 39.6 25.0$	$3.0 ~ 50.5 27.4$	$424 ~ 436 431$	$0.48 ~ 0.64 0.56$	中-好
	碳质粉砂岩	$6.4 ~ 69.8 27.5$	$7.0 ~ 130.4 49.5$	$427 ~ 443 435$	$0.73 ~ 0.94 0.83$	好
红柳沟老煤矿	暗色泥岩	$3.4 ~ 5.2 4.4$	$6.1 ~ 6.9 6.5$	$427 ~ 435 430$	$0.39 ~ 0.44 0.42$	好
	碳质泥岩	$3.9 ~ 26.8 15.3$	$2.5 ~ 27.0 14.8$	$425 ~ 429 427$	$0.53 ~ 0.60 0.57$	中
	煤	$54.4 ~ 70.0 60.1$	$31.5 ~ 108.1 64.4$	$420 ~ 426 423$	$0.54 ~ 0.58 0.55$	中-差
其格勒克	暗色泥岩	$1.2 ~ 4.4 2.9$	$0.06 ~ 3.9 0.9$	-	-	中
其格勒克	碳质泥岩	$20.0 ~ 23.5 21.6$	$8.7 ~ 52.3 24.4$	-	-	中
艾莎汗托海	暗色泥岩	$0.4 ~ 3.8 1.4$	$0.06 ~ 1.3 0.3$	$417 ~ 542 514$	-	中-差
	碳质泥岩	$0.6 ~ 29.6 10.8$	$0.07 ~ 16.6 5.7$	$452 ~ 542 512$	-	中-差
	煤	$16.0 ~ 38.9 29.9$	$0.03 ~ 4.7 1.2$	-	-	差

Fig.6 Kerogen types of the Lower Jurassic Kangsu source rocks in the Washixia Sag

Fig.7 Thickness distribution of Jurassic source rocks in the marginal Tarim Basin depression and organic carbon content in the Lower Jurassic Kangsu Formation (data except for SE Tarim Basin are from references [7,24,28-34])

Table 3 Comparison of geochemical characteristics of the Lower Jurassic source rocks in the Tarim Basin (Data except for SE Tarim Basin are from references [7,24,28-34])

地区(钻井或剖面)	岩性	有机质丰度		有机质类型	有机质成熟度
地区(钻井或剖面)	岩性	TOC/%	P_g/( mg/g)	有机质类型	有机质成熟度
塔东南瓦石峡凹陷 (若参1井、红柳沟老煤矿剖面、其格勒克剖面)	暗色泥岩	1.2~5.2^*	0.06~6.9	Ⅱ₂型-Ⅲ型	未成熟-低成熟
	碳质泥岩	3.9~39.6	2.5~52.3
	煤	54.4~70.0	31.5~108.1
塔西南喀什凹陷 (库兹贡苏剖面、杜瓦煤矿剖面、依格孜牙剖面等)	暗色泥岩	0.1~5.1	0.01~13.5	Ⅲ型	高成熟-过成熟
	碳质泥岩	0.06~0.4	0.1~5.7
	煤	44.9~71.9	37.6~94.3
塔北库车坳陷 (依南2井、阳1井、库车河剖面、吐格尔明露头)	暗色泥岩	0.4~5.5	0.5~36.0	Ⅲ型	低成熟
	碳质泥岩	7.1~39.6	9.8~160.3
	煤	32.7~79.3	76.5~106.7
塔东英吉苏凹陷 (英南2井、华英参1井、阿南1井)	暗色泥岩	0.2~5.7	0.9~3.8	Ⅲ型	未成熟-低成熟
	碳质泥岩	4.8~34.6	35.3
	煤	35.8~74.3	121.0

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