鄂尔多斯盆地陇东地区洪德区块侏罗系延安组油藏富集规律

doi:10.11743/ogg20220513

Abstract

Abstract:

The Jurassic in the Hongde block， Longdong area， Ordos Basin， has been less explored until some oil discoveries were made in the same system of nearby blocks. The Yan’an Formation in the Hongde block is taken as the subject of study to reveal conditions for possible oil accumulations in the formation based on relevant core， logging， seismic and testing data as well as analyses of sedimentary systems， tectonics and paleo geomorphology-the three most likely controlling factors for oil pooling. The results indicate that from the Yan’an Formation to the Yanchang Formation in the area there are three local unconformities respectively between the Fuxian Formation and the Yanchang Formation， the Yan 10 sub-member （Yan’an Formation） and Yanchang Formation， and the Yan 9 sub-member （Yan’an Formation）and Yanchang Formation. Five types of pre-Jurassic paleomorphologic units are also recognized：the paleovalley， inter-channel hill， ancient terrace， slope belt and low residual hill. Among them， the slope belt and low residual hill are conducive to hydrocarbon accumulation，and the ancient terrace and valley in the Yan 10 sub-member also have certain hydrocarbon accumulation potential. In addition， favorable conditions for oil accumulation also exist in the slope mouth where sandbodies have low shale content as several tributaries converged here and washed shale away. Oil caps and oil-water contacts are easily recognized. From a plan view， fault zones are intersecting sandbodies. The hanging walls of faults form perfect traps for oil， while the footwalls， without effective sealing， are usually barren in terms of oil pool. Normal faults are comparatively better oil pool holders than reverse ones. High-quality sedimentary reservoirs are necessary but insufficient conditions for the Yan’an Formation to contain oil pools. Based on the understanding， a method for identifying reservoirs in the Jurassic Yan’an Formation in the Hongde block is proposed.

Key words: sedimentary reservoir, Yan’an Formation, paleomorphology, structure, Jurassic, Ordos Basin

CLC Number:

TE122.3

Shuai Yin, Zhonghu Wu, Xiaoming Wu, Jianping Liu, Chengqian Tan, Ruyue Wang, Hui Yuan, Yawei Dai. Oil enrichment law of the Jurassic Yan’an Formation， Hongde block， Longdong area， Ordos Basin[J]. Oil & Gas Geology, 2022, 43(5): 1167-1179.

Figures/Tables 16

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Table 1

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古地貌单元	延10—富县组地层厚度/m	古地貌特征
古河谷	> 60	地势低洼、地形最低
古阶地	≈ 40	古河道和斜坡带之间平缓河道阶地，地形起伏较小；原先河流的谷底，由于河流的下切侵蚀，原侵蚀面相对抬升到洪水位以上，呈阶梯状顺河道分布于古河道两侧
斜坡带	< 40	具一定坡度，地形相对较高，周围被古河道环抱
河间丘	40～60	古河道中央，地势高于河道
低残丘	< 20	古斜坡上局部发育的凸起，规模小而孤立

分类参数		Ⅰ类储层	Ⅱ类储层	Ⅲ类储层	Ⅳ类（非储层）
孔隙结构特征	填隙物含量/%	≤ 10.0	10.0～14.0	≥ 14.0	≥ 14.0
	面孔率/%	≥ 12.0	8.0～12.0	≤ 8.0	≤ 8.0
	可动流体饱和度/%	≥ 50	45～50	40～45	≤ 40
物性特征	孔隙度/%	≥ 16.0	13.0～16.0	10.0～13.0	≤ 10.0
物性特征	渗透率/（10^-3μm²）	≥ 12	8～12	4～8	≤ 4
含油性特征	含油饱和度/%	≥ 40	30～40	20～30	≤ 20
砂体规模	砂地比/%	≥ 0.35	0.40～0.60	0.20～0.40	≤ 0.20
砂体规模	砂体厚度/m	≥ 12	9～12	6～9	≤ 6

成藏要素	一级控藏要素				二级控藏要素						三级控藏要素
	古地貌				构造圈闭			断裂			沉积储层
	低残丘	斜坡带	古阶地	古河谷	顶部	翼部	底部	靠近正断裂	靠近逆断裂	距断裂 > 2 km	Ⅰ类	Ⅱ类	Ⅲ类
权重系数（P）	0.15	0.20	0.10	0	0.10	0.10	0	0.20	0	0.05	0.05	0.05	0
权重加和	0.45				0.45						0.10

井号	生产层位	试采日产量/t	成藏要素匹配													权重系数（P）	成藏要素匹配程度	试采结论	成藏要素与试采吻合程度
			古地貌				构造圈闭			断裂			储层
			低残丘	斜坡带	古阶地	古河谷	顶部	翼部	底部	靠近正断裂	靠近逆断裂	距断裂 > 2 km	Ⅰ类	Ⅱ类	Ⅲ类
巴54	延10	0.06		√				√			√				√	0.30	不匹配	低产	符合
罗283	延7	0.01		√					√	√			√			0.25	不匹配	低产	符合
虎209	延9	5.40			√		√			√				√		0.45	强匹配	高产	符合
虎25	延9	1.48		√				√				√		√		0.40	匹配	低效	符合
虎218	延7	3.73	√				√			√				√		0.50	强匹配	高产	符合
虎208	延9	4.32	√					√				√		√		0.35	匹配	高产	符合
罗141	延9	6.28		√			√			√			√			0.55	强匹配	高产	符合
巴4	延9	4.45		√			√					√		√		0.40	匹配	高产	符合
木126	延7	0.30		√			√					√	√			0.40	匹配	低产	不符合

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Oil enrichment law of the Jurassic Yan’an Formation， Hongde block， Longdong area， Ordos Basin

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