四川盆地开江-梁平海槽周缘晚二叠世长兴期台缘礁滩沉积结构及其差异性

doi:10.11743/ogg20220408

Abstract

Abstract:

The reef-shoal gas reservoirs of Changxing Formation around the Kaijiang-Liangping trough in the Sichuan Basin are the major targets of natural gas exploration and development in eastern Sichuan Basin. However， few studies have been seen on the sedimentary architectures of reef-shoal around platform margin and their differences as of now. An integrated analysis of cores， thin sections， well logs， and seismic data， is applied to disclose the changes of slope angle at the front， lithologic composition of organic reef-shaol facies， reef cycle， external contour， vertical superimposition pattern， lateral migration， spatial distribution characteristics and differences around the trough， coupled with the seismic stratigraphic framework around the trough. The results are as follows. First， the Kaijiang-Liangping trough formed during the Late Permian rifting， when the NW-trending tensional basement-rooted faults were active， has nearly U-shaped platform marginal zones developed around. The palaeotectonic pattern of platform margin is characterized by “deep water in the steep northwest and shallow water in the wide and gentle southeast”. Second， the sedimentary architectures of platform margins around can be classified into four types， that is， the fault-controlled steep slope type with accretion rim， sedimentary steep slope type with accretion rim， gentle slope break type with retrograding strip， and extremely gentle slope type with discrete migration. These architectures are in alternative distribution around the trough， the western and northern platform margin dominated by fault-controlled or vertical superimposed steep slope type and the eastern and southern by extremely gentle slope type with discrete migration. Third， tectonic palaeogeomorphology and sea level eustacy jointly control the formation of sedimentary architectures of the platform margin in the study area and their differences. Among others， the former controls the pattern of the platform margin and accommodation of organic reef， and the latter controls the sedimentary architecture， migration and superposition of reef-shoal.

Key words: organic reef-shoal facies, platform margin, sedimentary architecture, Changxing Formation, Late Permian, Kaijiang-Liangping trough, Sichuan Basin

CLC Number:

TE121.3

Xu Chen, Mingyi Hu, Changhai Xu, Dawei Wang. Sedimentary architectures of reef-shoal facies at the platform margin during Changxing times of the Late Permian around Kaijiang-Liangping trough in the Sichuan Basin and their differences[J]. Oil & Gas Geology, 2022, 43(4): 833-844.

Figures/Tables 9

Fig.1

Fig.2

Fig.3

Table 1

Statistics of sedimentary parameters of organic reef?shoal facies from typical wells in the Changxing Formation at the platform margins around the Kaijiang?Liangping trough"

区块	井号	主要岩石类型	次要岩石类型	台缘带宽度/m	前缘斜坡角度/（^°）	地层厚度/m	礁厚度/m	滩厚度/m	白云岩厚度/m	礁滩厚度/地层厚度（Kr）	礁旋回期次/礁滩总期次
龙岗	龙岗1	生物礁灰岩、生屑灰岩	泥晶灰岩、少量白云岩	1 452	41	315	101	160	6	0.82	4/5
	龙岗3	生物礁灰岩、生屑灰岩	泥晶灰岩、少量白云岩	1 325	42	324	132	130	11	0.81	4/5
	龙岗6	生屑灰岩、生物礁灰岩	泥晶灰岩、少量白云岩	1 798	35	268	101	110	8	0.74	3/5
龙会场	铁山5	泥晶灰岩、礁灰岩、生屑灰岩	生屑云岩及白云岩	2 041	32	263	64	77	5	0.53	2/4
	浦西1	泥晶灰岩、生屑灰岩	少量白云岩	1 750	31	295	55	65	2	0.42	2/4
	龙岗81	泥晶灰岩、生屑灰岩	生物礁灰岩、少量白云岩	1 900	24	254	43	89	4	0.51	1/3
龙门	七里8	生屑灰岩	泥晶灰岩、生物礁灰岩	1 924	32	288	39	45	9	0.34	2/3
	天东10	生屑灰、白云岩	泥晶灰岩、少量礁灰岩	2 310	27	281	30	75	30	0.46	2/4
	龙岗84	泥晶灰岩、生屑灰岩	礁灰岩	2 400	26	263	18	58	5	0.48	2/4
七里北	七里北2	生屑灰岩、礁灰岩	生屑云岩、白云岩	1 900	32	279	55	110	50	0.59	3/5
七里北	七里北101	泥晶灰岩、生屑灰岩	生屑云岩、礁灰岩、白云岩	2 180	28	230	69	88	66	0.62	2/3
黄龙场	黄龙1	泥晶灰岩、生屑灰岩	生屑云岩、生物礁灰岩、白云岩	2 120	24	286	27	66	15	0.36	2/2
黄龙场	黄龙8	泥晶灰岩、生屑灰岩	生物礁灰岩	2 330	18	212	33	82	20	0.52	1/2
五百梯	温泉3	泥晶灰岩、生物礁灰岩	生屑灰岩、白云岩	3 580	9	268	45	74	32	0.27	2/3
	天东11	泥晶灰岩、生物礁灰岩	生屑灰岩、白云岩	3 620	8	213	65	20	79	0.39	2/2
	天东2-11	泥晶灰岩、礁灰岩	砂屑灰岩、白云岩	3 715	7	210	43	41	45	0.41	2/2
云安场	云安12	生屑灰岩、礁灰岩、泥晶灰岩	砂屑灰岩	3 800	5	168	35	36	32	0.33	2/4
	云安14	砂屑灰岩、泥晶灰岩	生物礁灰岩	3 848	4	190	25	37	37	0.24	1/1
	兴隆1	泥晶灰岩、礁灰岩	生屑云岩	3 781	2	170	28	24	20	0.25	1/2

Table 1

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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Sedimentary architectures of reef-shoal facies at the platform margin during Changxing times of the Late Permian around Kaijiang-Liangping trough in the Sichuan Basin and their differences

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