渤海湾盆地北大港潜山中生界碎屑岩储层特征及发育主控因素

doi:10.11764/j.issn.1672-1926.2019.08.004

Abstract

Abstract:

The shallow clastic reservoir in the buried hills of Beidagang has become an important oil and gas resource potential interval. It is necessary to further explore the characteristics of clastic reservoirs and their main controlling factors. In this paper, the experimental data of the core, cuttings, flakes, X-ray diffraction, mercury intrusion, scanning electron microscopy, etc. of the Mesozoic in the study area are used. Based on the petrological characteristics, main diagenesis and reservoir space characteristics of the clastic reservoirs in the target interval, the characteristics and developmental controlling factors of the Mesozoic clastic reservoirs in the study area were analyzed. The results show that the Mesozoic clastic reservoir in the study area is dominated by lithic feldspathic sandstone and feldspathic lithic sandstone, and a small amount of lithic sandstone and feldspar sandstone are developed. In the process of reservoir formation, compaction, cementation, dissolution and metasomatism happened; the storage lamination rate is 21.49%-56.63%, with an average of 34.35%, which belongs to medium compaction-strong compaction stage. The reservoir is dominated by secondary dissolved pores, and the primary pores and fractures are less developed. The overall performance of the reservoir is characterized by low porosity and low permeability, but some wells have high-porosity and high-permeability intervals. Reservoir development is mainly controlled by sedimentation, diagenesis and tectonic action. The dominant phase (band) of the sand-rich segment of the Mesozoic clastic reservoir in the study area is not obvious, and the influence of the separation coefficient on the pore size of the reservoir is greater than that of the rock. The abnormal high pressure formed by differential compaction is an important factor in the formation of high quality reservoirs, secondary pores formed by dissolution are the key to the development of clastic reservoirs in the study interval. The tectonic action caused the rapid burial depth and the formed slope of the Mesozoic strata in the study area, providing conditions and sites for the development of various high-quality reservoirs.

Key words: Buried hill in Beidagang, Mesozoic reservoir, Reservoir characteristics, Controlling factors

CLC Number:

TE122.1

Zu-bing LI, Jian LI, Jun-feng CUI, Li-ping XING, Xue-song WU. The reservoir characteristics and main controlling factors of the Mesozoic clastic reservoirs in buried hill, Beidagang, Bohai Bay Basin[J].Natural Gas Geoscience, 2020, 31(1): 13-25.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Table 1

Characteristics of whole rock analysis by X-ray diffraction about some Mesozoic wells in the study area"

序号	井区	层位	矿物含量/%								备注
序号	井区	层位	硬石膏	石英	钾长石	斜长石	方解石	白云石	菱铁矿	黏土总量	样品数/个
1	官142	中生界	$0 ~ 3.17 1.355$	$4.35 ~ 57.79 37.12$	$0 ~ 50.21 21.78$	$0 ~ 43.51 13.05$	$0 ~ 43.70 9.39$	$0 ~ 5.07 0.36$	$0 ~ 1.7 0.45$	$5.78 ~ 42.95 17.5$	152
2	港古1507	中生界	$0 ~ 0 0$	$2.9 ~ 17.49 12.06$	$11.65 ~ 27.94 19.2$	$0 ~ 0 0$	$4.20 ~ 21.69 12.9$	$0 ~ 0 0$	$0 ~ 13.2 5.98$	$32.87 ~ 72.76 49.55$	181
3	女86	中生界	$0 ~ 3.22 0.64$	$39.58 ~ 76.86 53.98$	$6.22 ~ 28.91 16.61$	$0 ~ 25.58 10.42$	$0 ~ 12.75 4.75$	$0 ~ 0 0$	$0 ~ 0 0$	$5.11 ~ 29.51 13.59$	89

Table 1

Fig.4

Table 2

Fig.5

Table 3

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

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序号	井号	井深/m	层位	黏土矿物绝对含量/%	黏土矿物相对含量/%					间层比/%(S)
序号	井号	井深/m	层位	黏土矿物绝对含量/%	高岭石	绿泥石	伊利石	伊/蒙混层	蒙脱石	间层比/%(S)
平均值				6.12	57.3	12.9	10.5	7.4	12.0	8.9
1	官142	2 500.6	中生界	3.72	69.0	11.7	16.3	3.0	0.0	5.0
2	官142	2 575.6	中生界	7.78	49.1	33.2	17.2	0.5	0.0	/
3	官142	2 578.9	中生界	8.46	67.3	24.1	5.9	2.7	0.0	10.0
4	官142	2 584.3	中生界	2.3	84.9	3.5	4.0	7.6	0.0	10.0
5	官142	2 585.8	中生界	4.93	61.7	14.7	5.8	7.3	10.5	10.0
6	官142	2 588.1	中生界	2.01	75.0	3.8	4.1	2.3	14.8	5.0
7	官142	2 593.6	中生界	9.14	46.7	19.6	2.1	31.6	0.0	20.0
8	官142	2 594.4	中生界	13.73	67.1	3.8	13.6	0.2	15.3	/
9	官142	2 595.9	中生界	6.1	33.0	14.8	30.6	21.6	0.0	10.0
10	官142	2 598.6	中生界	5.26	70.5	18.1	6.5	1.9	3.0	5.0
11	港古1507	2 042.4	中生界	3.55	35.9	3.4	5.3	0.0	55.4	/
12	港古1507	2 043	中生界	6.43	27.0	4.0	14.7	9.9	44.4	5.0

孔隙类型		对应岩类	成因推断	充填及含油气情况	组合特征
原生	粒间孔	细砂岩、中砂岩	岩石颗粒间未被胶结或仅部分被胶结充填	部分或大部分被充填，有油气显示	多与次生的溶蚀孔隙及裂缝相连
原生	砾间孔	砾岩、含砾砂岩	砾石间、砾石与岩石颗粒间未被完全胶结或充填	边缘多被充填，中间留有孔缝，含油气性好	多与裂缝相连
次生	溶蚀孔	长石砂岩、岩屑砂岩、火山岩屑、碳酸盐岩胶结物、硅质胶结物	岩石或胶结物在酸性及碱性环境中发生溶解作用	部分或大部分孔隙被充填，油气显示好	多与裂缝相连
	溶蚀缝	含砾砂岩、不等粒砂岩和含砾砂岩	在原有的裂缝中发生扩溶蚀作用，形成不规则的裂缝	未充填至完全充填，含气性好	构造—溶蚀缝与孔隙相连
	裂缝	各类岩石均有，但以含砾砂岩为主	构造应力作用	开启—半充填，含油气性好	与孔隙、溶缝相连

The reservoir characteristics and main controlling factors of the Mesozoic clastic reservoirs in buried hill, Beidagang, Bohai Bay Basin

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