川南海相页岩岩石相类型及“甜点”分布——以长宁双河剖面五峰组—龙马溪组为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.006

Abstract

Abstract:

With the comprehensive application of the photography of full thin section, the optical microscope observation of small thin sections, TOC test, whole rocks X-ray composition test, physical property analysis and the observation of field emission scanning electron microscope, Ordovician Wufeng Formation amd Silurian Longmaxi Formation in Shuanghe Outcrop in Changning area are analyzed systematically. The results show that the black shale of Wufeng-Longmaxi Formation in Shuanghe Outcrop of Changning area in southern Sichuan Basin is mainly siliceous shale, calcareous shale and mixed shale, and the average values of quartz, calcium carbonate and clay minerals are 42.5 %, 37.4 % and 14.9 %, respectively, containing a small amount of plagioclase （average 2.5 %）, pyrite （average 2.7 %） and organic matter （average 5.6 %）. The black shale develops mud laminae and silty laminae, and these two types of laminae are composed of five bedding types: graded horizontal bedding, homogeneous bedding, banded silty sand horizontal bedding, sand mud graded horizontal bedding and sand mud thin interbedded horizontal bedding. Progressive horizontal bedding and homogeneity bedding are developed in Wufeng Formation, while strip silty sand horizontal bedding, sand-mud progressive horizontal bedding and sand-mud thin interbedded horizontal bedding are developed in Longmaxi Formation. On the basis of mineral composition and bedding types, eleven types of lithofacies are divided. LM1 member, which is the “sweet spot” interval in Shuanghe Outcrop in Changning area, is characterized by high TOC content, high siliceous content, high porosity, high permeability, high horizontal/vertical permeability ratio and high organic pore content. The strip silty sand horizontal bedding develops here.

Key words: bedding, lithofacies, black shale, Longmaxi Formation, Wufeng Formation, Sichuan Basin

CLC Number:

TE121

WANG Hongyan,DONG Dazhong,SHI Zhensheng,QIU Zhen,LU Bin,SHAO Nan,SUN Shasha,ZHANG Surong. Lithfacies and “sweet spot” interval of marine shale in southern Sichuan: A case study of Shuanghe Outcrop in Wufeng-Longmaxi Formation, Changning[J].Reservoir Evaluation and Development, 2022, 12(1): 68-81.

Figures/Tables 10

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References 48

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层理类型	类型	组成	粒序	界面特征	分布
纹层	泥纹层	黏土级颗粒大于50 %		连续、板状、平行	五峰组—龙马溪组
纹层	粉砂纹层	粉砂级颗粒大于50 %		连续、板状、平行断续、板状、平行断续、波状、平行	龙马溪组
层	砂泥递变型	泥纹层和粉砂纹层互层	正递变、反递变	连续、板状、平行	龙马溪组
	正递变	泥纹层	正递变	连续、板状、平行连续、波状、平行	五峰组—龙马溪组
	反递变	泥纹层	反递变
	均质层	泥纹层	均质
层理	砂泥薄互层型水平层理	由泥纹层和粉砂纹层薄互层构成,泥纹层与粉砂纹层突变接触,泥纹层/粉砂纹层为1—5	砂泥交互	连续、板状、平行断续、板状、平行断续、波状、平行	SLM2—SLM4
	砂泥递变型水平层理	由砂泥递变型水平层理构成,泥纹层/粉砂纹层为5—10	正递变、反递变	连续、板状、平行	SLM1-2,SLM4-5
	条带状粉砂型水平层理	由泥纹层构成,偶夹薄层粉砂纹层,泥纹层/粉砂纹层大于10	均质	连续、板状、平行断续、板状、平行	SLM1,SLM5
	均质层理	由泥纹层构成	均质		SWF7—SWF8
	递变型水平层理	由正递变或反递变层构成	正递变、反递变	连续、波状、平行	SWF4—SWF7

岩石相	样品号	孔隙度（%）			渗透率（10^-3 μm²）
岩石相	样品号	水平	垂直	水平/垂直	水平	垂直	水平/垂直
条带状粉砂型水平层理	8-31-1	6.85	6.4	1.07	0.184 285	0.000 655	281.35
条带状粉砂型水平层理	9-11-1	7.26	6.31	1.15	0.047 955	0.002 761	17.39
砂泥递变型水平层理	8-10-1	9.35	9.04	1.04	0.223 54	0.025 925	8.62
	8-31-2	5.43	4.13	1.31	0.002 291	0.000 351	6.53
	9-19-2	4.90	5.98	0.82	0.010 954	0.002 876	3.81
砂泥薄互层型水平层理	SLM4-1	4.17	4.21	0.99	0.005 743	0.000 714	8.04
递变型水平层理	4-2-1	1.47	1.27	1.16	0.001 49	0.000 124	12.02
递变型水平层理	M001	0.60	0.88	0.68	0.000 931	0.000 575	1.62
均质型块状层理	5-26-2	1.93	1.18	1.68	0.000 313	0.000 364	0.86
	5-29-2	4.16	3.17	1.32	0.000 342	0.000 419	0.82
	SWF6-1-2	2.08	1.73	1.22	0.000 316 9	0.000 316	1.00
	5-34-3	1.16	1.11	1.05	0.000 028	0.000 083	0.34

Lithfacies and “sweet spot” interval of marine shale in southern Sichuan: A case study of Shuanghe Outcrop in Wufeng-Longmaxi Formation, Changning

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