中国南海珠江口盆地西江油田运聚再生油藏模式创新认识与挖潜效果

doi:10.11743/ogg20210220

Abstract

Abstract:

To tackle problems in understanding the distribution and mechanisms of remaining oil reservoirs in mature offshore oilfields of middle or later stages of development, this study focuses on the migration direction and migration-accumulation time of remaining oil in various types of reservoirs in Xijiang oilfield, PRBM, South China Sea, while combining "potential control theory" with "reservoir architecture interface" and taking single sand body in the reservoirs as research unit.It concludes that the remaining oil mainly concentrates in low-potential trapped areas, and thereby constructs a "migration-accumulation regenerated reservoir model".The results show that: (1) Sand bodies in major pay reservoirs are mainly superimposed with rare interbeds; the reservoirs are mostly high-porosity and high-permeability and conducive to generate preferential seepage channels.After shutting wells down for about one year, the remaining oil migrates and accumulates in small amounts to high parts of structures of low potential energy and beyond well area.These wells tend to yield high but only for a short time after the 1 year shut-in.(2) Sand bodies in non-major pay reservoirs are usually laterally overlapping or completely isolated with the well developed third- and fourth-order architectural interfaces in the reservoirs.The dynamic migration and accumulation time and direction of remaining oil are related to reservoir rhythm, interlayer order and fluid property.After shutting wells down for more than 3 years, the remaining oil in these reservoirs that once were controlled by the fourth-order interfaces gradually flows around and accumulates into low-potential closed areas; those once controlled by the third-order interfaces would accumulate in large scale in low-potential closed areas by vertical permeation.These wells perform good after 3-year shut-in with high production for a long time.The research results are of technically supportive value to the rejuvenation of mature offshore oil fields in medium-high water cut stage and to the realization of the company's annual production target.

Key words: interface of diverse orders, potential control theory, migration and accumulation, reservoir regeneration model, tapping effect, Pearl River Mouth Basin (PRMB)

CLC Number:

TE327

Yi Tu, Zhenghe Yan, Jianwen Dai, Yahui Wang, YiDong Zhu, Yong Yang, Jiao Yang, Weifeng Wang. New understanding and tapping effect of remaining oil reservoirs in Xijiang oilfield, PRBM, South China Sea[J]. Oil & Gas Geology, 2021, 42(2): 522-532.

Figures/Tables 12

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井号	投产日期	关井日期	生产层位	距第一口新井B-1投产(2014/10/29)
井号	投产日期	关井日期	生产层位	位置	运聚时间/a
Y-14	1997年6月	2004年1月	T5-2/T6-1/T6-2/T8/T9/T11/T12/T13	高部位	10
Y-17	1999年6月	2005年10月	T8/T9/T11/T12/T13	边部位	9
Y-18	2000年6月	2003年7月	T5-2/T6-1/T6-2/T8/T9/T11/T12/T13	中部位	11
Y-20	2001年5月	2004年7月	T5-2/T6-1/T6-2/T8/T9/T11/T12	高部位	10
Y-22	2002年6月	2004年12月	T5-2/T6-1/T6-2/T8/T9/T11/T12	高部位	10
Y-23	2003年3月	2009年6月	T5-2/T6-1/T6-2/T8/T9/T11/T12/T13	高部位	5
Y-18-1	2003年9月	2009年1月	其他层位	中部位	5
Y-24	2004年2月	2006年3月	T6-1/T6-2/T8/T9/T12	边部位	8
Y-14-1	2004年6月	2007年2月	T6-1/T6-2/T8/T9/T12/T13	中部位	7
Y-20-1	2004年8月	2008年3月	T5-2/T6-1T6-2/T8/T9/T12	高部位	6
Y-1-1	2005年2月	2008年9月	T6-1/T6-2/T8/T9/T11/T12	中部位	6
Y-22-1	2005年9月	2007年5月	T5-2/T6-1/T6-2/T8/T9/T11/T12	中部位	7
Y-17-1	2006年1月	2009年3月	T12	高部位	5
Y-24-1	2006年6月	2007年5月	T6-1/T6-2/T8/T9/T12	中部位	7
Y-14-2	2007年6月	2013年7月	T6-1/T6-2/T8/T9/T12	中部位	1
Y-22-2	2008年2月	2015年11月	T6-1/T6-2/T8/T12	西北边部位	0
Y-24-2	2008年10月	2011年3月	T6-1/T6-2/T8/T9/T12	高部位	3

界面级次	5级界面	4级界面	3级界面
构型要素	水下分流河道复合体河口坝复合体	单一分流河道单一河口坝	分流河道增生体
沉积剖面
发育特征	岩性以泥岩为主，渗透性差，延伸范围广，以隔层遮挡流体纵向和横向流动	以泥岩或粉砂质泥岩为主，物性差，渗透率较差，对砂体内流体具有垂向遮挡作用	以泥质粉砂岩、钙质砂岩为主，厚度较薄且延伸范围有限，局部遮挡作用或延缓流体的流动

模式	模式1	模式2	模式3	模式4
模式图
夹层类型	无夹层	小范围半渗透型夹层	大范围半渗透型夹层	大范围不渗透型夹层
分布范围	无夹层	1~3个井区	3~4个井区	5个井区以上
厚度/m	＜0.5	1.0~2.0(主要集中在1.0 m左右)	2.0~4.0	＞4.0
渗透率/(10^-3 μm²)	＞10.0	1.0~10.0	＜0.1	＜0.1
泥质含量/%	＜10	10~30	＞30	＞50
驱替特征	底水驱	次生底水驱次生边水驱	次生边水驱	衰竭式
油井特征	高产短命	高产高效长命	高产高效	低产短命
典型油井	Y1-8H，Y1-5H1	Y1-4H，Y1-10H	Y1-6H，Y1-9H	Y1-02，Y1-13HA，Y1-3H高部位
层位	T11，T13	T4B，T1B1	T9，T3G	T6B，T12，T9，T11

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New understanding and tapping effect of remaining oil reservoirs in Xijiang oilfield, PRBM, South China Sea

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