Technological iteration and understandings of exploration and development as well as increase of shale oil reserves and production in Paleogene fine-grained sediments areas of Huanghua depression
The laminated shale oil resources in Huanghua depression of Bohai Bay Basin amount to 3.26 billion tons,which is 1.2 times the conventional oil resources,showing great potential for exploration and development;however,the large-scale efficient development and production still face many problems such as optimization of high-yield sweet spot layers,optimal fast drilling and well completion of long horizontal sections of complex fault blocks,uniform and efficient fracturing,and efficient mining methods.For this reason,it is es-sential to continuously deepen the understanding of the enrichment conditions of"medium resources-high reserves-optimal preservation"for continental laminated shale oil,achieve a systematic breakthrough in benefit evaluation of the shale oil sweet spots and box selection,well pattern arrangement,optimal fast drilling and well completion,fracturing transformation,and production system.of continental shale oil in complex fault blocks,and propose the shale oil enrichment law and model of"medium and high matching",which are sum-marized to form the replicable and promotable major development technologies,such as multi-sweet spot W-shaped three-dimensional development and well arrangement,dense-cutting high-strength pre-carbon dioxide energized and efficient fracturing,and highly efficient drainage and production mode of"well killing for replacement+high-pressure drilling and plugging+pressure-controlling production".The application of iterative technology has achieved good results in the beneficial development experiment of No.5 platform in Cangdong sag.Among 5 test wells,the peak production of a single test well is 39.6-122.3 t/d,and up to June 28,2024,the self-flowing wells have produced oil continuously for 545-574 d,with a cumulative oil production of 8.9 X 1 04t.The first 100,000 ton laminated shale oil beneficial development demonstration platform in China has been built;major development technologies have been promoted further,the first pilot test platform of No.6 block of Member 3 of Shahejie Formation in Qikou depression was built and put into operation,and three self-flowing wells have produced oil continuously for 222-225 d,with a cumulative oil production of 1.64 × 1 04t.
Huanghua depressionPaleogenecontinental fine-grained arealaminated shaleshale oilbeneficial exploration and de-velopment
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