Architectures of and Remaining Oil Potential Tapping in Heavy Oil Reservoirs of Panyu Oilfield Group

doi:10.7657/XJPG20240207

Abstract

Abstract:

Due to the low oil recovery percent of reserves, developed barriers/interlayers, and difficult remaining oil prediction in the heavy oil reservoirs in the Panyu oilfield group, it is urgent to improve the accuracy of reservoir architecture analysis and prediction. Based on geological, seismic and logging data, together with GR return rate and big data statistical technologies, the 3rd-, 4th-, and 5th-order architecture boundaries in the reservoirs were identified, the distribution patterns of interlayers were studied, the internal structure of reservoir architecture units and the distribution of interlayers were quantitatively characterized, the main controlling factors and occurrence patterns of the remaining oil were analyzed, and the control of architecture boundary on remaining oil was clarified. The results show that the 3rd-order oblique progradational interlayers in the reservoirs can slow down vertical fluid flow, and the 4th-order superimposed horizontal interlayers can prevent vertical fluid channeling. The energy and direction of remaining oil migration are mainly constrained by the 3rd- and 4th-order interlayers and the rhythm differences. Ten ineffective and inefficient wells were sidetracked, which revealed an initial cumulative oil production of 680.00 m³/d, five times that before sidetracking.

Key words: Panyu oilfield group, heavy oil reservoir, reservoir, architecture boundary, barrier/interlayer, quantitative identification, remaining oil distribution, potential tapping technology

CLC Number:

TE112.2

TU Yi, DAI Jianwen, YANG Jiao, WANG Yahui, WANG Hua, TANG Zhonghao, LI Qi. Architectures of and Remaining Oil Potential Tapping in Heavy Oil Reservoirs of Panyu Oilfield Group[J]. Xinjiang Petroleum Geology, 2024, 45(2): 189-198.

Figures/Tables 11

Fig. 1.

Fig. 2.

Fig. 3.

Table 1.

Fig. 4.

Fig. 5.

Table 2.

Architecture characteristics of the heavy oil reservoirs in Panyu oilfield group"

分类		测井特征	构型界面级次	构型界面模式	成因	沉积相	厚度	分布规模	物性	典型油藏
岩性分类	成因分类	测井特征	构型界面级次	构型界面模式	成因	沉积相	厚度	分布规模	物性	典型油藏
泥岩隔夹层	洪泛泥岩	自然伽马回返率大于40%，分布稳定，基本全区可对比，多为隔层	5级		洪水间歇期形成的细粒沉积物或海泛面沉积	前三角洲	多大于2.0 m	多大于1.0 km，全区分布	孔隙度小于5%，渗透率小于5 mD，封隔性强	Z20、Z40、Z60、Z80、Z20、Z35、R10、R20
	间湾泥岩	自然伽马回返率为20%~40%，分布稳定，侧向与分流河道砂体对接，仅局部可对比	4级居多		由于水动力减弱，水中沉积物沉积下来，多为相变成因	水下分流间湾、河口坝侧缘	主要为0.8~2.5 m，平均为1.5 m	多为0.6~1.0 km，宽厚比约为500	孔隙度为3%~8%，渗透率小于20 mD，封隔性强	Z40、Z60、Z35、Z46、R60、R10、R20、R30、R60、R80
	落淤泥岩	自然伽马回返率小于20%，厚度差异大，分布在河口坝反韵律砂体顶部，仅局部分布物性夹层	3级居多， 4级较少		短时间内水下分流河道间水动力弱，水中沉积物沉积下来可形成物性夹层	河口坝侧缘、水下分流河道侧缘、浪成砂坝主体	主要为0.2~1.0 m，平均为0.5 m	多小于0.2 km，平均宽厚比为350	孔隙度为5%~10%，渗透率小于40 mD，局部有一点渗透性	Z20、Z80、Z05、R60、R20
钙质隔夹层	顶部钙质夹层	自然伽马曲线不回返，密度剧增，分布在砂岩顶部，可对比	4级		生物碎屑及先前的碳酸盐胶结物提供钙质来源，形成可能与有机酸和黏土矿物转化有关	河口坝主体、水下分流河道主体、浪成砂坝主体	主要为0.2~1.0 m，平均为0.5 m	多为全区分布，也见局部发育，多大于0.6 km	孔隙度为2%~8%，渗透率小于5 mD，封隔性强	Z16.01、Z16.10、Z16.20、Z17.20、Z17.42、R15.60、R15.70、R16.01、R16.10、R16.30、R16.60
钙质隔夹层	层内钙质夹层	自然伽马曲线不回返，密度剧增，随机分布在砂岩内部和底部，不可对比	3级居多，4级较少		生物碎屑提供主要钙质来源，形成于海平面相对下降时期	河口坝主体、水下分流河道主体、浪成砂坝主体	主要为0.2~1.1 m，平均为0.7 m	多小于0.2 km，平均宽厚比为300	孔隙度为6%~12%，渗透率小于100 mD，局部有一定的渗透性	Z10、Z20、Z60、Z80、Z20、Z25、Z46、R70、R01、R40、R60

Table 2.

Fig. 6.

Fig. 7.

Table 3.

Fig. 8.

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油田名称	油藏名称	油藏类型	潜力井个数	油柱高度/m	富集部位	剩余油赋存模式	层内夹层构型界面主控因素	挖潜策略（低产低效井侧钻）
番禺B油田	Z40	底水	2	3.0	西南部	脊间型	层内4级界面	小井距、短井段
	Z60	底水	2	3.5	西南部	郊区型	层内3级界面	侧钻
	Z60	底水	2	6.0	北部	遮挡型	层内3级界面	侧钻
	Z80	底水	2	1.5	西南部	脊间型	层内4级界面	定向井
	Z80	底水	2	5.0	北部	遮挡型	层内4级界面	侧钻
	Z20	边水	1	2.0	北部高点	脊间型	层底4级界面	小井距、短井段
	Z25	底水	1	4.0	中部	遮挡型	层内3级界面	侧钻
番禺A油田	R60	底水	2	5.0~6.0	A09-2井与B05-1井之间、B10井以北	遮挡型	层内4级界面	侧钻
	R01	底水	2	4.0~5.0	A09-2井以南、B18井与B15-1井之间	脊间型	层内3级界面	侧钻
	R20	底水	6	6.0~10.0	井间加密	脊间型	层内3级界面	小井距、短井段
	R40	底水	1	3.2	A07井—A09-3井与A03井—A11井之间	郊区型	层内4级界面	侧钻
	R80	底水	1	6.0	A09-2井与A18-1井之间	遮挡型	层内4级界面	小井距、短井段
番禺B油田	Z20	底水	2	2.5~4.0	北部高点	遮挡型	层底3级界面	侧钻
	Z20	底水	2	3.0~4.0	南部	未动用	层内3级界面	侧钻
	Z05	底水	1	2.5~3.0	北部高点	脊间型	层底3级界面	侧钻
番禺A油田	Z40	边水	2	3.0~4.0	中—高部位	未动用	无夹层	侧钻
	Z50	底水	1	4.0	高部位	未动用	层内4级界面	侧钻
	Z90	底水	1	3.5	高部位	未动用	无夹层	侧钻
	H68	底水	1	6.8	高部位	未动用	层内4级界面	侧钻