致密砂岩储层注水诱导裂缝动态识别及演化特征

doi:10.11743/ogg20240516

Abstract

Abstract:

Prolonged waterflooding leads to the development of waterflood-induced fractures in tight sandstone reservoirs. Clarifying the dynamic responses and evolutionary characteristics of these fractures holds great geological significance for the emplacement of dense well patterns and the tapping of residual oil potential of tight sandstone reservoirs. Integrating data from core observations， logs， oil production， pressure-buildup well tests， and water injection profiles， we explore the dynamic responses and distributions of waterflood-induced fractures across different development stages within the tight sandstone reservoirs in the 8^th member of the Yanchang Formation （also referred to as the Chang 8 Member） in well block L， Jiyuan oilfield， Ordos Basin. The results indicate that waterflood-induced fractures in the tight sandstone reservoirs of the Chang 8 Member within well block L originate from the propagation of natural fractures， and the natural fractures exhibit a preferential opening direction of NEE-SWW and NE-SW， followed by NW-SE. The water injection profiles of injection wells tend to exhibit small water absorption thickness but high water absorption capacity due to the formation of waterflood-induced fractures. Concurrently， the production performance curves of wells display a spurt or stepped upward trend in water cut， while pressure-buildup well tests reveal open double- logarithmic derivative curves that trend upward at a slope of 1/2. In the case where waterflood-induced fractures occur between production and injection wells， the production well test-interpreted formation pressure exceeds that in wells without waterflood-induced fractures and even far surpasses the initial formation pressure. In the initial development stage of tight sandstone reservoirs in the Chang 8 Member within well block L， waterflood-induced fractures in the reservoirs are primarily found in east-central， northeastern， and southeastern parts of the well block， where natural fractures are well developed. Waterflooding causes changes in the reservoir stress and thereby the opening pressure of natural fractures decreases. As a result， in the middle development stage， waterflood-induced fractures striking NW-SW come into being in the southern and north-central parts of well block L， accompanied by the small-scale propagation of pre-existing waterflood-induced fractures. In the late development stage， further waterflooding triggers the opening of natural fractures in different orientations around injection wells， leading to the formation of small-scale waterflood-induced fractures. This further exacerbates the fracture-induced waterlogging of production wells.

Key words: dynamic identification, waterflood-induced fracture, tight sandstone reservoir, the 8^th member of the Yanchang Formation （Chang 8 Member）, Jiyuan oilfield, Ordos Basin

CLC Number:

TE122.2

Wenya LYU, Xiaoping AN, Yanxiang LIU, Desheng LI, Lianbo ZENG, Zhanhong HUANGFU, Yinghang TANG, Kening ZHANG, Yuyin ZHANG. Dynamic responses and evolutionary characteristics of waterflood-induced fractures in tight sandstone reservoirs： A case study of oil reservoirs in the 8th member of the Yanchang Formation， well block L， Jiyuan oilfield， Ordos Basin[J]. Oil & Gas Geology, 2024, 45(5): 1431-1446.

Figures/Tables 10

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	SPIVEY J P， LEE W J. Applied well test interpretation［M］. HAN Yongxin， SUN Hedong， DENG Xing， et al， translated. Beijing： Petroleum Industry Press， 2016.
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井名	井类型	试井日期	试井解释目前地层压力/MPa	试井曲线裂缝线性流特征	见水类型
L1井	采油井	2020-07-13	16.20	无	孔隙型
L4井	采油井	2015-12-11	14.93	无	孔隙型
L7井	采油井	2011-05-31	13.02	无	孔隙型
L7井	采油井	2014-05-08	24.89	无	裂缝型
L11井	注水井	2019-05-11	35.44	有	—
L11井	注水井	2020-06-17	38.83	有	—
L11井	注水井	2021-05-27	39.68	有	—
L11井	注水井	2022-04-23	39.78	有	—
L12井	采油井	2021-06-08	17.52	无	孔隙-裂缝型
L12井	采油井	2022-06-06	17.68	无	孔隙-裂缝型
L15井	采油井	2015-05-02	12.28	无	孔隙型
L15井	采油井	2016-03-19	11.19	有	孔隙型
L15井	采油井	2020-05-07	11.01	无	孔隙型
L16井	采油井	2011-05-15	9.31	无	孔隙型
L16井	采油井	2018-04-20	13.29	无	孔隙-裂缝型
L26井	采油井	2011-06-03	13.98	有	裂缝型
L26井	采油井	2012-07-30	24.64	有	裂缝型
L31井	采油井	2012-04-21	11.18	无	孔隙型
L31井	采油井	2015-08-03	16.12	有	孔隙-裂缝型
L31井	采油井	2017-06-28	11.48	无	孔隙型
L31井	采油井	2020-04-22	11.07	无	孔隙型
L42井	采油井	2014-04-21	17.27	无	裂缝型
L42井	采油井	2015-06-09	19.43	无	裂缝型
L42井	采油井	2018-05-24	18.71	无	裂缝型
L42井	采油井	2019-09-28	21.33	无	裂缝型
L42井	采油井	2020-06-27	19.62	无	裂缝型
L47井	采油井	2019-04-21	11.47	无	孔隙-裂缝型
L49井	采油井	2011-05-19	21.45	有	裂缝型

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Dynamic responses and evolutionary characteristics of waterflood-induced fractures in tight sandstone reservoirs： A case study of oil reservoirs in the 8th member of the Yanchang Formation， well block L， Jiyuan oilfield， Ordos Basin

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