Discovery of exogenous type shale gas and its geological significance to hydrocarbon exploration

doi:10.7623/syxb201801002

Acta Petrolei Sinica ›› 2018, Vol. 39 ›› Issue (1): 12-22.DOI: 10.7623/syxb201801002

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Discovery of exogenous type shale gas and its geological significance to hydrocarbon exploration

He Jianglin^1,2, Wang Jian^1,2, Yu Qian¹, Liu Wei¹, Ge Xiangying¹, Gou Qiyong³, Qiu Zhen⁴

1. Chengdu Center, China Geological Survey, Sichuan Chengdu 610082, China;
2. Key Laboratory for Sedimentary Basin and Oil & Gas Resources, Ministry of Land Resources, Sichuan Chengdu 610082, China;
3. Geology Research Institute of CNPC Greatwall Drilling Engineering Company Limited, Liaoning Panjing 124010, China;
4. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2017-07-13 Revised:2017-12-02 Online:2018-01-25 Published:2018-03-09

外源补给型页岩气的发现及油气地质意义

何江林^1,2, 王剑^1,2, 余谦¹, 刘伟¹, 葛祥英¹, 苟启勇³, 邱振⁴

1. 中国地质调查局成都地质调查中心四川成都 610082;
2. 国土资源部沉积盆地与油气资源重点实验室四川成都 610082;
3. 中国石油集团长城钻探工程有限公司地质研究院辽宁盘锦 124010;
4. 中国石油勘探开发研究院北京 100083

通讯作者: 何江林,男,1984年6月生,2007年获大庆石油学院学士学位,2010年获中国地质科学院硕士学位,现为中国地质调查局成都地质调查中心高级工程师,主要从事油藏地球化学和沉积学研究。Email:5hjl998@163.com
作者简介:何江林,男,1984年6月生,2007年获大庆石油学院学士学位,2010年获中国地质科学院硕士学位,现为中国地质调查局成都地质调查中心高级工程师,主要从事油藏地球化学和沉积学研究。Email:5hjl998@163.com
基金资助:
国家自然科学基金项目（No.41772126，No.41502150）、国家重大科技专项（2016ZX05034）和南方页岩气基础地质调查工程项目（DD20160176）资助。

Abstract

Abstract: According to field survey, it is found that a set of stable detachment layer is developed in Wufeng Formation of Sichuan Basin and its periphery, characterized by stable thickness (0.3-1.5 m)and special occurrence horizons, and may be a set of high-permeability carrier bed at the bottom of chief shale gas horizons in WuFeng-Longmaxi Formation. Based on the differences in the control of detachment layer on the enrichment of shale gas, shale gas can be divided in exogenous-supply type and in-situ enrichment type. Therefore, the operability of this classification scheme is preliminarily validated by a great discovery of shale gas in Well HD1 and Well XD2. Meanwhile, it is also confirmed through exploratory drilling that the investment return cycle of Well HD1 is similar to that of the current shale-gas exploratory well, and the hydrocarbon transport ability of "connecting planes" caused by detachment layer is greater than that of "connecting lines" generated by the artificial fracturing of shale-gas horizontal well. The enrichment laws of exogenous-supply shale gas not only well explain various problems in the present shale gas exploration and development processes, but also provide assistance in studying the enrichment laws of shale gas in China and the dynamic hydrocarbon accumulation mechanisms in complicated structural zones. The matched pinnate horizontal well technology is able to break through the industrial technical bottleneck of high cost and severe environmental pollution caused by shale-gas horizontal well fracturing, so as to realize the commercial fracturing-free development of shale gas.

Key words: oil-source fault, detachment layer, shale gas, Sichuan Basin, Silurian Longmaxi Formation, Well HD1

摘要： 野外调查发现，四川盆地及周缘五峰组内发育一套稳定的滑脱层，不仅厚度稳定（0.3~1.5 m），而且产出层位特殊，可能为五峰组-龙马溪组页岩气主产层底部的一套高渗输导层。根据滑脱层对页岩气富集控制作用的差异，可将页岩气分为外源补给型和原位富集型，华地1井和新地2井页岩气的重大发现，初步证实了该划分方案的可操作性。钻探也证实，华地1井投资回本周期与现今页岩气探井投资回本周期相近，滑脱层产生的"面"连通油气输导能力可能高于现今页岩气水平井人工压裂产生的"线"连通油气输导能力。外源补给型页岩气富集规律不仅能解释现今页岩气勘探开发过程中发现的诸多理论问题，而且对其进行深入研究将有助于中国页岩气富集规律和复杂构造区内油气动态成藏机理研究。配套羽状水平井技术将攻克因页岩气水平井压裂导致成本高、环境污染严重的行业技术瓶颈，实现页岩气免压裂商业开发。

关键词: 油源断裂, 滑脱层, 页岩气, 四川盆地, 志留系龙马溪组, 华地1井

CLC Number:

TE132.2

He Jianglin, Wang Jian, Yu Qian, Liu Wei, Ge Xiangying, Gou Qiyong, Qiu Zhen. Discovery of exogenous type shale gas and its geological significance to hydrocarbon exploration[J]. Acta Petrolei Sinica, 2018, 39(1): 12-22.

何江林, 王剑, 余谦, 刘伟, 葛祥英, 苟启勇, 邱振. 外源补给型页岩气的发现及油气地质意义[J]. 石油学报, 2018, 39(1): 12-22.

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Discovery of exogenous type shale gas and its geological significance to hydrocarbon exploration

外源补给型页岩气的发现及油气地质意义

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