松辽盆地北部古龙凹陷古页8HC井地质剖面特征

doi:10.13809/j.cnki.cn32-1825/te.2022.01.001

Abstract

Abstract:

In order to study the lithology, property and brittleness of Gulong shale reservoir, a whole-section coring well, Well-GY8HC, is deployed in Gulong Sag. Detailed core description and element analysis show that the sedimentary microfacies in Gulong Sag are mainly semi-deep to deep lacustrine facies during the sedimentary period of Q1 to Q9 reservoirs, with thick organic-rich shale developed and can be subdivided into four types of lithology which are shale, siltstone, shell limestone and dolomite. Based on the classification principle of “structure+lithology” and combined with the lithology content characteristics, the lithofacies are divided into four types which are laminated shale, intercalated shale, massive dolomite and massive siltstone. The paleo-sedimentary environment is fresh water-brackish water+weak provenance+strong reduction in warm and humid climate, providing favorable place for organic matter formation and preservation. Comprehensive evaluation of three indexes of reservoir capacity, oil-bearing property and fracability shows that several reservoir space types of Q1 to Q3 reservoirs with good physical property, excellent oil bearing property and efficient fracability for shale oil production, being the most favorable interval for medium and high mature shale oil exploration in Daqing Oilfield.

Key words: geological section, sedimentary facies, Well-GY8HC, Gulong Sag, Sichuan Basin

CLC Number:

TE122

Wenyuan HE,Zihui FENG,Jinyou ZHANG, et al. Characteristics of geological section of Well-GY8HC in Gulong Sag, Northern Songliao Basin[J]. Reservoir Evaluation and Development, 2022, 12(1): 1-9.

Figures/Tables 7

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References 15

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指标油层	长英质（%）	黏土矿物（%）	碳酸盐岩（%）	TOC（%）			游离烃S₁（mg/g）			有效孔隙度（%）
指标油层	长英质（%）	黏土矿物（%）	碳酸盐岩（%）	最小值	最大值	平均值	最小值	最大值	平均值	最小值	最大值	平均值
Q1油层	40	40	20	1	5	1.8	3	12	6.5	2.8	8.8	6.1
Q2油层	50	40	10	1	5	2	3	10	5.7	4.9	10.1	7.3
Q3油层	50	38	12	1	4	1.9	3	10	6.2	6.7	11.2	8.1
Q4油层	45	35	20	1	4	1.9	3	12	5.3	3.5	11.1	7.2
Q5油层	52	40	8	1	3	1.5	3	10	4.6	3.8	9.0	6.1
Q6油层	50	35	15	1	3	1.5	2	8	4.1	4.7	12.0	7.1
Q7油层	45	30	25	1	4	1.6	3	10	4.8	6.0	10.9	8.7
Q8油层	52	36	12	1	3	1.6	3	10	5.2	7.7	11.9	9.5
Q9油层	58	34	8	1	3	1.4	3	9	4.8	7.1	11.6	9.0

岩相类型	矿物组分	沉积构造	有机质特征
纹层状页岩相	V_sh﹥45 %;V_ca﹤20 %;V_sa﹤30 %	页理发育,纹层不发育,仅偶见黄铁矿纹层和长英质纹层,厚度小于0.1 cm	TOC≥2.5 %
夹层状页岩相	V_sh约35 %~45 %;V_ca﹤10 %;V_sa约40 %~50 %	页理发育,纹层发育,厚度小于1 cm	TOC≥2 %
块状粉砂岩相	V_sh﹤10 %;V_ca﹤5 %;V_sa﹥80 %	块状层理或者脉状层理,岩性为纯粉砂岩或者粉砂岩夹薄层的泥岩脉	TOC<0.5 %
块状白云岩相	V_sh﹥10 %;V_ca﹥70 %;V_sa﹤15 %	页理与纹层均不发育,外观呈薄层状或透镜状	1 %≤TOC<2 %

Characteristics of geological section of Well-GY8HC in Gulong Sag, Northern Songliao Basin

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